Shitsuren Mania

from hochuuami :An ongoing series revolving around Atsuya, who is an "Unrequited Love Maniac" and the possible lovers he acquires.Prequel: Hatsukoi Moratorium inside Shotgun Marriage (Nakura x Atsuya)Vol.1: Shitsuren Mania (Unrequited Love Mania)Vol.2: Junnai Allergy (Allergy to Pure Love)Vol.3: Netsuai Complex (Ardent Love Complex)Vol.4: Dekiai Egoism (Enraptured Love)Vol.5: Katsubou Catharsis (Catharsis of the Love)Vol.6: Saiai Ambivalent (The Dearest is Anbivalent)includes characters from a few other mangas by the same author.