Destruction is in the next room.

Handsome features, brilliant intellect, gentle and sincere character, excellence in both academics and martial arts. My older brother, my pride and joy, was perfect in every way. Then one day, he suddenly disappeared—and a year later, when he returned, he had become my classmate. He's still my older brother. My beloved older brother. He should be my brother... and yet. Something's off. Something's wrong. —Who is he?