Synopsis
In the third year of high school, Izumi Toosaka reunited with his younger brother, Kaoru Yano. Seven years after their parents divorced, they decided to live together in a shared dorm room. Lower voice, red-dyed hair, mature expressions, an unknown surname... Izumi becomes attracted to him, who has changed so much that he doesn't even realize he is his younger brother at first. Even though they are supposed to be siblings, this emotion in his heart is...?
(Source: Taiyo Tosho, translated)