The Gemini Princess wants me to confess my feelings!

Reborn in a parallel world of Tokyo, the bad news is that his parents are dead and he's being hunted by yakuza. The good news is that he's been adopted by a prestigious family. What does it mean to have a pair of adorable twins in your family? What does it mean they're both my childhood sweethearts? ... "Who will you choose, me or my sister?" "And who is that music teacher outside?!"