主角·武道做什麼事情都不順，又住在破舊老公寓裡，從電視上得知國中時期的前女友·日向無端捲入幫派火拼而身亡。某天他在月台等車，居然跌落鐵軌，正他以為自己死定了，回神之後卻發現自己回到12年前的國中時期。後來又遇上了日向的弟弟·直人，告訴他12年後發生的事實，要求他要保護姐姐，雙方握手之後他又再次回到現代……。
主角·武道做什麼事情都不順，又住在破舊老公寓裡，從電視上得知國中時期的前女友·日向無端捲入幫派火拼而身亡。某天他在月台等車，居然跌落鐵軌，正他以為自己死定了，回神之後卻發現自己回到12年前的國中時期。後來又遇上了日向的弟弟·直人，告訴他12年後發生的事實，要求他要保護姐姐，雙方握手之後他又再次回到現代……。
Producer
Executive Producer
Background Art (Art Design)
Animation Director (ep 2, 10, 16), 2nd Key Animation (ep 16), Key Animation (ep 10)
Script (French)
ADR Director
Storyboard (eps 2, 10, 17), Episode Director (ep 2)
Director of Photography
Mechanical Design
Producer
Episode Director (ep 24)
Character Design
Character Design, Animation Director (OP1)
Sound Director
Series Composition
2nd Key Animation (eps 1-2)
Episode Director (ep 6, 16, 22)
Animation Director (ep 1)
Key Animation (OP)
Original Creator
Key Animation (ep 2)
Chief Animation Director (eps 13, 19, 21, 24)
ADR Director
Art Director
Executive Producer
Theme Song Performance (OP)
Animation Director (ep 2)
Storyboard (ep 9), Episode Director (ep 9)
Director, Episode Director (ED1, ED2), Animation Director (ep 19), Key Animation (ED2)
Storyboard (eps 16, 19-21)
Script
2nd Key Animation (ep 1)
2nd Key Animation (ep 1)
Key Animation (ep 1)
Planning
Planning
Storyboard (ep 7), Episode Director (ep 23)
Key Animation (ep 1)
Executive Producer
Associate Producer
Associate Producer
Associate Producer
Producer
Producer
Producer
Producer
Producer (Animation Producer)
Episode Director (eps 1, 8)
Theme Song Performance (ED)
Producer
2nd Key Animation (ep 2)
Music
ADR Director
Theme Song Arrangement (ED1), Theme Song Composition (ED1)
2nd Key Animation (OP1, ED2)
2nd Key Animation (OP1, ED2)
Key Animation (ep 2)
2nd Key Animation (ep 1), Animation Check (ep 1, OP1, ED2), In-Between Animation (ep 1)
Associate Producer
Episode Director (eps 11, 17)
2nd Key Animation (eps 1-2)
Episode Director (eps 7, 10)
Storyboard (ep 14), Episode Director (ep 14), Key Animation (eps 1, 3)
Episode Director (ep 19)
2nd Key Animation (eps 1-2)
Amamiya is kawaii!
完結散花～～好看！