High schooler Junichi Nagase steps in when a pair of delinquents corner a girl named Yuuhi Katagiri, and they run off jeering the nickname that follows him around town, 'Geno Killer.' The next day Yuuhi turns up as a transfer student in his class, a misunderstood kiss makes things worse, and by evening she's at his door announcing that their families arranged an engagement and that she's moving in to judge whether he's worth it. Their parents give the pair one month of dates to decide whether the match survives. This two-volume manga adapts feng's original visual novel.