Don't Leave It All To Me- DLIATM-HikaruSaga

A boy name Izanagi Hikaru is left to deal with the young adult named Daisuke, Hideaki Daisuke. Meeting him on the rooftop of the school, seeing him almost kill himself, revealed pain from his own memories. After chatting with him, Hikaru soon realizes that Daisuke is his new step brother, and the papers were finalized...