Suzumemura Ao

When Izumi Shiori's father is transferred away for his job, Izumi wanted to stay to finish high school so he moves in with his cousins. The younger cousin Joe was just like how Izumi remembered him, but the older cousin Karen has become a beautiful young woman.

A reboot of Hirohiko Araki's "Cool Shock B.T." series published in Saikyo Jump. Middle schooler Koichi Mugikari befriends the "Wicked Boy" B.T. after the latter saves him from a pair of extortionists. The two end up becoming involved in an incident with an arsonist live streamer.