Sefure Jijou, Koibito Miman!セフレ以上、恋人未満! ; 床伴以上 恋人未满 ; More than sex friends but less than lover ; Sefure Ijou, Koibito Miman

Nanami, a college student addicted to sex, is called out by one of his many sex friends, the arrogant Kazuma. When he goes to their rendezvous place, he's shocked to discover a second Kazuma! It's actually Shoma, his twin brother