I Thot You Was a Toad's manga / #art student(4)

Haruna, a art student, picks up the injured stranger, Shiki, on the street and tends to his wounds because he reminds him of a stray cat he once rescued. Shiki has been driven out of the nearest town, and his arm is covered with intricate, traditional yakuza-style tattoos. When Shiki moves to leave, Haruna holds him in an embrace to stop him from going, but they really know nothing about each other and it ends tragically.

The art school theme is incidental to this story about a gay professor with an experienced lover who inveigles a younger, naive student into a threesome.