「私が“生きる希望”をあげる」架橋明日は家族を事故で失い、引き取られた親戚のもとでも辛い日々を送っていた。全てに絶望した少年は、中学校を卒業したその日、ビルの屋上から身を投げる。しかし、少年はそこで1羽の天使と出会う――!?
Mirai Kakehashi is a young orphaned high school student who lives with his abusive aunt and uncle after the death of his parents and brother. One day, Mirai decides he cannot take it anymore and attempts to commit suicide, but is saved by a Guardian Angel called Nasse, who also gives Mirai special powers. Upon learning from Nasse that his aunt and uncle were responsible for the deaths of his father and mother due to their jealousy and hatred toward to them, Mirai uses the powers that she bestowed to him in order to enact justice upon them. This is only the beginning of Mirai’s story, however, as Nasse soon after informs him that God will retire in 999 days and thirteen candidates to replace him were selected, one of which is Mirai. To make matters worse, not only is Mirai forced to take part in the contest to decide the next God, but some of the other candidates will do anything to win, including killing all of the other candidates as soon as possible. To combat these ruthless killers, Mirai forms an alliance with several candidates who share his goal: to win the contest without killing any other competitors.
“ฉันจะให้ความหวังแก่คุณในการมีชีวิตอยู่” ฮาชิวะ อาสึสูญเสียครอบครัวไปจากอุบัติเหตุ และต้องใช้ชีวิตอย่างยากลำบากร่วมกับญาติๆ ของเขา เด็กชายผู้สิ้นหวังในทุกสิ่ง กระโดดลงมาจากหลังคาอาคารในวันที่เขาสำเร็จการศึกษาจากโรงเรียนมัธยมต้น อย่างไรก็ตาม ที่นั่นเขาได้พบกับนางฟ้า!