I played the VN. It is extraordinarily unimaginative and lazy and every character in it is retarded. The anime is supposedly one branch of the VN.
It's "But I did eat breakfast: The Game". Very cool premise, goes absolutely nowhere with it, replaces it with a different (worse) time travel mechanic, punches you in the balls for trying to think. The protagonists are supposed to be scientists, geeks and fans of a score of time-travel stories it name-drops, but they are completely incapable of thinking, designing effective experiments, recalling the lessons and concepts of the name-dropped stories, or not telling every random stranger they have a working time machine. Whenever there's an unexpected development, it's because the writer is just too stupid. There's 1 (one) joke in it, 30 hours in.