I'd Probably Kill 100 Friends.

What is the value of one life versus many? Abiru Sagara lives a blessed life. He has loving parents, an adorable little sister, and hasn't once experience any adversity or strife. That is, until a sinister god targets him and his perfect world comes crashing down. His father suddenly commits suicide, his mother joins a cult and bankrupts the family, then his beloved sister is given a year to live. When the cruel goddess finally appears before him in his darkest moment, she offers to save his sister, but at the cost of 100 of his "friend's" souls. The boy, unable to see through his grief, sets forth on his bloody journey...