Serial Skill User Suicide Phenomenon

The Serial Suicides of Special Ability Users is a case forwarded to the Armed Detective Agency by the Ministry of Home Affairs to investigate the reason behind the sudden deaths of ability user and to investigate Tatsuhiko Shibusawa, an ability user who calls himself the "collector", who is suspected of being tied to the incident.

Description
After a strange fog appears at the scene, ability users around the world are suddenly committing suicide one after another.