About Figures of Happiness

I have an argument with my girlfriend and we break up. The girl who actually causes it is suddenly killed in an accident; I'm dumbstruck when her spirit suddenly appears before me.
"Please lend me your life force so I can confess my feelings to the guy I love."
Deciding to help her out, I lend her my life force, but... No one told me that I'd become a spirit during all of this!! I've got to get my life force back before it's too late! To accomplish this, I get to use someone else's body, but things get complicated... Every time I turn around, there's another figure to deal with!