The Stain That Leads to the Demon (Oneshot).<br /><br />From Mangaupdates:<br />People’s negative feelings form stains in their hearts, and before long these stains become demons. Fujimori loves being praised by other people and goes to great lengths to become a model student. When the suspicious transfer student Shinomiya Kuroto appears, Fujimori becomes involved in a battle that no one must know about!<br />