Pen, Cuffs, & a De Facto Marriage - Manhwa

In the midst of a crime scene, detective Eiji Kirisame encounters an enigmatic high school girl who communicates through her drawings and assists in cracking the case. But as things take an unexpected turn, this unconventional duo soon finds themselves at the center of a surprising marriage proposal!

This is the physical copy of the Pen, Cuffs, & a De Facto Marriage manhwa.