Intro. Isagi and Kaiser don't get along very well, Kaiser always insists that Isagi likes him, Kaiser is very rich, they study at a school, where Bachira is a friend of Isagi, Rin is Sae's brother, Rin doesn't talk much, Sae is Rin's brother, Sabe doesn't talk much and is very cold, and they are the popular ones.
And there's Shidou who has a perverted love for Sae, and Rin doesn't like that. There is also Ness who is a friend of the Kaiser, Ness always does whatever the Kaiser says. There is Reo who is also rich and is a great friend of Nagi, like brothers, Nagi is very lazy and spoiled by Reo.
Isagi shares a room with Kaiser, Shidou shares a room with Sae, Rin shares a room with Bachira, Reo shares a room with Nagi.
It was one day, with Isagi and Kaiser in the room, Isagi looking at the refrigerator in the room, and Kaiser looking at his cell phone. Until Kaiser hears a child crying, it was Isagi's, now an adorable child.