Pen to Wappa to Jijitsu-konペンと手錠と事実婚; A Marker, Cuffs, and a De Facto Marriage; A Marker, Cuffs, & a De Facto Marriage; Hôn thú giữa bút và còng tay; 笔与手铐与事实婚姻; بين قلم التعليم والأصفاد والزواج الفعلي; قلم وأصفاد

A middle-aged detective, Eiji Kirisame (40), meets a strange high school girl at the scene of a certain crime. She doesn't speak a word, but she helps solve the case using her drawings. However, suddenly this middle-aged detective is getting a marriage proposal from this girl!