This girl is the part timer Asuka (Tokushige's little sister) having trouble with which causes her to quit. Shortly after she quit, she got kidnapped and raped by another group of people that seems to be lead by the dude in Chapter 56. Then this group offer her to Tokushige in exchange for...
If she possessed him to make him killed himself, is it possible for someone to cleanly cut their own throat because his corpse have been slit on the neck?
That what most JP authors go with nowadays,
easy to make, easy to discard.
It shows that their average story writing ability & motivation has gone down rapidly in this decade...