The Haunted Bookstore - Gateway to a Parallel Universe manga volume 4 features story by Shinobumaru and art by Medamayaki.

FINAL VOLUME!

Suimei first came to the spirit realm in order to find his missing partner, but he’s stuck around in order to sort through his feelings regarding his troubled childhood. When he is put in charge of caring for a troubled soul, can he find a way to heal both of them? Meanwhile, Kaori has problems of her own when her father goes missing! As she and Suimei search for him, they uncover a plot that could threaten the whole spirit realm!