Author Ryusei Kaji's Secret Passion(2015)

K-sensei no Himitsu no Netsujou

A pushy novelist and his always serious and square editor. The fourth book about Ryusei Kaji and Midori Kobayakawa. A book that fans can't miss!

Their relationship started when Midori couldn't turn down Ryusei's aggressive advances. Midori starts to realize he misses Ryusei on the days he can't see him, but doesn't want to interfere with his busy schedule. He finds himself longing for Ryusei for days.

One day, Midori's friend Sho visits him in Tokyo. But, things turn for the worse when Ryusei becomes angry with Midori for bringing Sho to visit him!

(Source: Renta!)

Note: Includes four extra chapters.