From Renta!:

"It's close to college." For that simple reason, Masato is using fellow student Atsushi's apartment like his second house. In exchange, he helps the always-late Atsushi get up in the morning and makes him breakfast. His friend Takashi says their relationship's weird and that Atsushi's too into him. While Masato's aware of Atsushi's affection, he always figured it was normal - never realizing that his attitude has been affecting Atsushi's feelings…