A Unique take on the Time Travel genre, this anime focuses on a group of eccentric friends who find a way to send messages through time & face the unexpected ripples that it created. The first 12 episodes are very slow where the story hardly moves and it was hard for me to keep watching but after that the thriller element came into forefront which made it a lot better. The main characters are very well developed & the writing in the last episodes can make you emotional. Its hailed as one of the greatest animes, I wouldnt agree to it but its well worth a watch.