Mona no Kusho

This story follows the point of view of the personification of Depression named Kusho and her goal to take out her victim shes been with for 20 years, a girl named mona ,for years its been a battle of how long will it take till she breaks and give in to kusho embracing the end, in kusho eyes mona is delaying the inevitable and needs to accept her fate. however two others are with mona mentally due to mental trauma and constant mental break downs she has who she calls her mental family that will step in when things get bad even though she wants to die herself. the question is will Kusho finally be able to take out mona or will she be forever at war with the mental family of three that protect their host.