Living as a lecturer at a university, Sumi Keisuke, finds himself drawn to a college student, Shiromoto Kotarou, who soon becomes his newest muse. Keisuke ends up obsessively desiring the boy, clinging onto him with his all his five senses.

From Hoshikuzuu Scans:

Suguru and Yoshiichi were neighbors who were always together until the day Suguru decides to move away. When they entered junior high, as promised, Suguru came back. But he was unable to transition into their high school, so he is thinking of taking exams for other schools. Yoshiichi’s image of the Suguru who’s always by his side shatters a bit. He became upset, lonely and jealous. Even when his heart swells so much and all he can think of is him…On top of Amadare no Koro, we’ve included an epilogue of their story, titled “Engage Key Holder” and a side story of Suguru’s friend’s love story titled “Haru no Iki”.