Once upon a time, there was a boy, and he conquered came into intimate relationship with space and time. After that, his cute girl was killed.
Not agreeing with this order of things, he continuously relived his last few days, however, regardless of how he changed the events, the cute girl would die either way. Sometimes, he seemed to save her, but then, even greater forces would emerge that wanted to kill her on the next day.
In his quest, he is helped by his trustful friends: a cute smart girl, a cute maid girl, a cute soldier girl, other cute girls and a cute trap.
And the coordinator of the evil forces was in the same house all along.
What is this, you ask? Of course it is one of the best anime I've ever witnessed, made by White Fox.
10/10, would die for cute girl's smile again - MC.