Guilty pleasure

Kazuki and Chiharu first start having some relationship, Kazuki goes to his brother's house a lot to meet up with his nephew. Chiharu calls Kazuki a burden and tries to separate. They confess and become a true couple. Kazuki becomes an intern using an alias. Kaoru is introduced, Kazuki gets mad, and Kaoru lives in his home for a while. Kazuki tell Chiharu to not visit him and Chiharu decides to send Kazuki abroad aaand Chiharu attempts to kill Kazuki.

Chiharu has a marriage meeting, Kazuki gets jealous and also befriends Daigo resulting in a jealous Chiharu

Kazuki and Chiharu are in a party, Kazuki gets jealous of the women hanging Chiharu. Kazuki tries to make Chiharu jealous to see him suffer. Kazuki thinks that Chiharu is a real man while he is just a brat. Kazuki sets up another party, ends up spending the night with ladies, and comes home to an angry Chiharu. Kazuki provokes Chiharu, he gets jealous, pushes Kazuki away and he avoids Kazuki. Kazuki realizes he screwed up and pursues Chiharu. Then they make up. Jin & Jun one-shot