Idol Kinsei

Ikuto enrolled in a school with a dormitory to escape the feeling of inferiority to his successful older twin brother, Takuto. There, Ikuto met the idol Sin from the group Double Moon, whom he was a big fan of. Except... Shinnosuke Tsukishima, or Sin, was a completely different persona off stage. He was a super flirty man!
Ikuto felt troubled by Shinnosuke's antics at first, but he started to realize that perhaps he could love him in another way. However, he could never be sure when Shinnosuke was being serious or not. Could real love grow between an honorary student and a popular idol?
(Source: Shinshokan, translated)