Honkai Impact 3rd: This is how Obito and Rin used it.

Kamui's tears are hard to hide, all he sees is Rin. The greatest romantic in the ninja world, Uchiha Obito, has provocatively issued a challenge to you. Please choose your response: 1. Use your pathetic taijutsu to meet him. Reward: A satisfying beating. 2. Use your clumsy ninjutsu to amuse him. Reward: Laughter from your classmates. 3. Accept Uchiha Obito's invitation, confess your love to Rin, and unleash your strongest attack on Obito. Reward: A 100x taijutsu technique amplification card. Shingetsu Seiun: I'm sorry, Obito. Shingetsu Seiun: I'm sorry, Rin, I wanted to give them a home. Shingetsu Seiun: I'm sorry everyone, I did this for the ninja world…