Middle-aged police detective Eiji Kirisame brilliant deductions have unraveled case after case, but now he's totally stumped: How can he possibly convince the infatuated highschooler Tsugumi Kuchinashi to give up on marrying him!? Especially when she's helped solve three cases already, and is blackmailing him into letting her move in with him! When Kirisame's next case takes him to her school, he finds more than he bargained for--in more ways than one...