Metal Bat

When Dazai Inugami, the bat wielding class clown, is diagnosed with late stage Glioblastoma cancer he starts to dissociate and on the train ride home he bumps arms with a mysterious man who drops The Ring of Enma at his feet. When Dazai puts it on it binds itself to his finger and turns him into a half soul, an easy target for possessions. Now with time running out him and his friends make it their goal to find one worthy ghost who can possess him, sharing his body, giving the spirit another chance at life while also riding him of his cancer.