Toshishita no Ryuugi
年下の流儀
Yuusuke and Atsushi are not connected by blood, but became brothers when their parents remarried. They have not seen each other for several years, ever since Yuusuke moved to Tokyo for university. Now Atsushi has also enrolled in a university in Tokyo and comes to live with Yuusuke, catching him by surprise.
Three years have brought many changes. Atsushi has matured, grown much taller, and become colder than Yuusuke remembers. The distance between them has grown, and Yuusuke must find a way to bridge the gap and reconnect with the younger brother he once knew.
