I enjoy the characters but the plot holes drive me crazy.

Takemitchi is a boy who can travel through time, and what does he want to do? Save some girl he was in love with when he was 14. Ok, fine. It ends up being pretty cute, but my problem is...how is he so bad at saving her? He can TRAVEL THROUGH TIME. He knows the exact minute she is going to die. Originally she was going to die in a car crash, so he tells Naoto to save her...and he fails? How? You know she is going to die in a car crash how the hell did he let her get in a car?

The only way this story makes sense is if Naoto is secretly a villain who wants his sister to die...don't love that ending but at least the story isn't littered with plot holes.

The only other way we can say this story doesn't have excessive plot holes is if we later find out Takemitchi is brain dead. Takemitchi gets a lot of hate for crying so much; I hate him for having a superpower and utilizing it in the worst possible way.