In this crossover anime, I've been bound to two systems.

My purpose has been discovered, but it doesn't seem to matter.

I didn't marry her, but we grew up together and aren't related by blood, so it's only natural that we developed feelings for each other.

Judging from the current situation, the Isshiki couple have a considerable degree of affection for her, which is good. The only thing to pay attention to now is Isshiki herself and her own thoughts.

After she gradually became more sensible at the age of twelve, whether out of embarrassment or shyness, she drifted further and further away from me. This is not a good sign and I need to pay more attention.

After finishing her water, Suzumiya Senri got up and poured herself another glass. She casually rubbed the head of the sleeping Black Winged Bird before leaning back against the headboard.

The sound of an adult film playing next door, after an hour of comedy, started up again. It seemed to have automatically recharged over time. This time it appeared to be an NTR (Netorare) film. Suzumiya Chisato could vaguely hear the opening line, "Madam, you don't want to either..." It was so cliché.

Chisato Suzumiya cleared her mind of distractions and refocused her attention on the simulated text.

[16 years old: You have excellent grades and have entered a very famous and excellent high school in Tokyo. The Isshiki couple excitedly accompanied you to the opening ceremony. They, who have long regarded you as their own child, held your arms and took many photos with you at school. You smiled happily in the photos, but there was a shadow in your heart, because you did not see Isshiki Iroha appear at this important moment for you.]

On the way back, you tell Isshiki and his wife that you are a little tired today and don't want to celebrate by eating out. You want to go home and rest first.

The Isshiki couple cancelled their restaurant reservation and drove you home. Mr. Isshiki didn't get out of the car and drove straight to work, while Mrs. Isshiki changed her coat after arriving home and went to a nearby supermarket.

After you got home, you went straight up to the second floor. As you passed Iroha Isshiki's room, you heard girls talking inside. You recalled that there seemed to be a few more pairs of small leather shoes in the entryway, and you decided...

1. Since the guests have come to our home, it's only natural to serve them tea and snacks.

2. I was just passing by.

3. Perhaps I can learn some of her thoughts by reading her conversations with her friends.

It's a seemingly ordinary option.

Option one seems to be planning to use the excuse of entertaining guests to knock on the door and join in, but anyone with a little common sense knows that this is not a good choice. The girls are having a nice chat, what would it look like if a boy suddenly walked in?

Doing this would likely only make Isshiki Hatake and her friends feel awkward and embarrassed, further widening the gap between them, who were already distant from her, and giving her the bad impression of "lacking boundaries."

Option two is a perfectly normal choice, so I chose to ignore it.

But is normal necessarily correct?

Looking back on the years of stagnant relationship between himself and Iroha Isshiki, Suzumiya Senri vaguely felt that the priority of this seemingly normal option two was even lower than that of option one.

The reason is simple: although option one's behavior is reckless, the fact that it has resulted in disgust or hatred has indeed created a relationship with Isshiki Hatake, at least causing her to have emotions towards him, rather than choosing to stay out of it and become an insignificant person, as in option two.

As for option three, although it wasn't explicitly stated, Chisato Suzumiya felt there was a high probability that it involved eavesdropping.

Although it's not exactly polite, Chisato Suzumiya thinks this option is relatively appropriate for the current situation.

Unlike Option 1, which might lead to being disliked, or Option 2, which involves ignoring the situation and letting it develop freely beyond one's control, this option allows one to make judgments and plan actions in advance if useful information is obtained from the shadows.

After thinking it over, Suzumiya Chisato chose option three.

You return to your room and press your ear against the wall to eavesdrop on Isshiki and her friends' conversation. The girls' topics are very scattered and unrelated. One moment they are talking about the latest popular TV series, and the next moment they are talking about the appearance of the male supporting character in the series, and how cute the Tibetan fox is and how much they want to keep one at home.

You were slightly disappointed; the conversation you overheard wasn't exactly unhelpful, but it was utterly pointless. Just as you were about to give up eavesdropping, Iroha Isshiki's voice came through, and you perked up. You heard her suggest going to the nearby indoor swimming pool this week, and the other girls chimed in.

You noted down the time and place, silently pondering...

[1. Then, find an opportunity to subtly hint to Isshiki that you have plenty of free time on the weekend.]

2. Leave early on the weekend and pretend to bump into each other at the swimming pool.

[3. Isshiki Hatake can't swim, and I've never seen her show any interest in swimming before. Why did she suddenly decide to go swimming?]

Surprisingly, a questionable option appeared.

Suzumiya Chisato was somewhat surprised. He first eliminated the first option, and then looked at the remaining two options with some difficulty.

Because in his view, both options seemed to be the right choice.

However, he didn't hesitate for long and ultimately chose the unfamiliar questioning option, choosing to believe in the wisdom of the Sims.

You know Isshiki very well. She's not exactly spoiled, but she's not far off. She's a bit of a picky eater, very sensitive to both cold and heat, and loves to crawl into the kotatsu in winter. The first thing she does when she gets home in summer is turn on the air conditioner. She's also very sensitive to pain; even a twisted ankle will make her eyes well up with tears. If she gets spanked, she'll cry out loud, and that soft, sweet voice is so lovely. The more you hear it, the more you like her…

You stopped your wandering thoughts from going any further and began to pay attention to the reasons behind Isshiki's unusual behavior.

The next morning, a package arrived at the house. You had just signed for it when Isshiki Hachiman hurriedly took it back to her room.

[You go for a jog in the evening and casually pick up the trash from your house to throw it away. Inside the trash bag, you see a square, flat box—the packaging for an electronic weighing scale.]

You seem to have realized something.

…………

Chapter 127 Angry Sister Ayaha

[When it comes to girls' anxieties during puberty, "weight" is always at the top of the list. You used the excuse that your computer was broken and you needed to look up some study materials to get permission from Iroha Isshiki to use her computer. While she went downstairs to get water, you checked her website history and discovered the following content.]

["How to lose weight quickly?" "Is it true that running will make your calves thicker?" "The scientific basis for swimming to lose weight." "How long does it take to see results from swimming to lose weight?"]

Looking at these historical records, you can't help but think that the little girl who used to chase after you and drag you into playing fighting games has really grown up. She used to be able to show off two cream cakes late at night, but now she barely eats dinner and is even concerned about her figure.

After you confirmed what was bothering Isshiki, you closed the history and pretended to start studying. Isshiki returned to her room, glanced at you, and quietly lay down on the bed to read a magazine.

You glanced at her furtively, your gaze following the curves of her legs and thighs upwards, revealing the soft flesh of her waist as her top was slightly lifted, and her delicate profile framed by healthy flaxen hair.

From your perspective, she's not fat at all, so there's absolutely no need to be anxious. Besides, it wouldn't matter if she were a little chubby; she'd be cute even if she were a bit plump. But you can only think these things to yourself. You know that if you say them out loud, you'll definitely get a look of disdain and contempt from her.

Shortly after, you shut down your computer, thanked Iroha Isshiki, and returned to your room. Leaning against the headboard, you looked at the pink alarm clock Iroha Isshikiki had given you last year on your desk, realizing that this might be the opportunity for your increasingly distant relationship to rekindle its intimacy.

【You decide……】

[1. Show off your impressive chest and abs to Iroha, enticing her to ask you about your secrets to maintaining your figure.]

[2. He proactively tells Isshiki Yu that he knows a special weight loss secret.]

[3. When you catch a glimpse of Isshiki Yu at home, deliberately look at her thighs and waist, and let out a deliberate chuckle.]

Three distinct options emerged.

Option one is to feign indifference, allowing Isshiki Hachiman to take the initiative to speak to you, thus leading to further plot developments.

But will things go so smoothly?

Considering Iroha Isshiki's personality so far, Suzumiya Chisato is very skeptical about the success rate of this plan.

Option two involves speaking directly as her older brother, offering to solve her problems, regardless of how special her weight loss secret is.

I have a feeling that something is off. How can I explain that I discovered she wanted to lose weight, which seems unnatural? And given their current relationship, I have a feeling that even if I bring it up, I'll be rejected.

Option three... it just feels a bit cheap.

To be fair, this option seems to fit the typical sibling relationship. Although my behavior may seem a bit childish and like I'm deliberately picking a fight, I might be able to attract Isshiki's attention in this special way and, for better or worse, reconnect with her on another level.

Suzumiya Senri's eyes slowly brightened, and he felt his thoughts becoming increasingly sharp and insightful.

Without hesitation, he chose the third option.

[You chose to use a roundabout approach, provoking Isshiki's dissatisfaction in order to create communication between you.]

That afternoon, the Isshiki couple attended a dinner party, leaving only you and Iroha at home. After washing the dishes, you went to the living room and saw Iroha dressed in casual loungewear, sitting on the sofa watching TV.

You walked over, pretending to pick up a banana from the fruit bowl on the coffee table. Your gaze inadvertently met hers, and she hurriedly looked away. You, however, calmly lowered your gaze, placing it on her waist. Then, you glanced down at her thighs, which she was awkwardly pressing together. You let out a soft, undisguised laugh, then deliberately pursed your lips, feigning nonchalance, and turned to leave.

As you expected, after this series of actions, Issei Iroha angrily called out to you.

[The game unfolds from a first-person perspective, allowing for a degree of freedom of movement...]

Consciousness drifted away from the brain, the surrounding environment was filled with interplay of light and shadow, and after a moment of blurred vision, Suzumiya Chisato found herself in a very cozy living room.

He stood in front of the single sofa, facing a much shorter girl with delicate features and a graceful figure.

"What are you laughing at all of a sudden, you idiot!"

Dissatisfied words came out of Iroha Isshiki's mouth in a soft tone.

Although it was clear that she wanted to express anger, she seemed to lack confidence because of her natural height, so after saying those words unconsciously, she regretted it and sat back down on the sofa.

After glancing at Suzumiya Chisato, her nominal brother, she guiltily shifted her gaze back to the television. With one hand, she pulled her shirt down, trying to cover some of her thighs, while with the other, she grabbed the TV remote, turned off the TV, and tried to escape back to her room.

Suzumiya Chisato was still quite surprised as she clenched and unclenched her fist, experiencing the newly upgraded first-person perspective.

Being able to move around to some extent is much more pleasant than being able to only passively experience things.

"Caiyu, have you gained some weight recently?"

After the initial excitement wore off, Suzumiya Chisato didn't forget her purpose and called out to her stepsister, who was about to go upstairs and was not related to her by blood.

Iroha turned around, her cheeks puffed out like a hamster hiding food, and her hands gripped the slightly long cuffs of her sleeves.

"What did you say!"

"I said you seem to have gained a bit of weight."

Suzumiya Chisato walked over, revealing the same sly smile as before.

He pointed to Iroha's waist and thighs.

"Clothes that used to feel loose now feel a bit tight, and the legs of my shorts feel much narrower."

Iroha slapped his hand away, covered her chest with her arms, and took a step back with a terrified expression.

"Whoa—what kind of look do you give your sister all day long, you lewd brother!"

"Such an obvious thing doesn't need special attention to notice. Let's not change the subject, chubby sister."

"Get lost! I'm not fat, my clothes just shrank from being washed too many times!"

"And what about the face? The cheeks are chubby, how do you explain that?"

"Idiot...you moron! Moron! Fool! Who wants to explain to you!"

With all her might, Isshiki Yu said these words and ran up to the second floor.

"You're going to break the stairs!"

"!"

Isshiki poked her head out and angrily threw down the fluffy slippers she was wearing.

Chisato Suzumiya easily caught it with one hand.

Ichiro Yuhwa stormed back to her room, making a loud noise as she opened the door.

…………

Chapter 128 The Beginning of the Operation