I love time travel anime like Erased, Stein's Gate, the Girl Who Leapt Through Time, Mirai, etc. But this show is not very good.

Premise is neat about a loser going back in time to save his girlfriend while he becomes a stronger, more confident person, but there's not enough likeable characters (you're supposed to cheer for gangs, no thanks). Maybe gang culture is big in Japan but I just couldn't root for any of these characters. There weren't really any female characters besides the girlfriend and she just seemed like a cute/nice character the main had to save (just a prize).

As other reviewers have noted, there are massive plot holes that open up immediately that derail the story further.

Animation is nice at least.