During spring break, Chase, a young otter who grew up in Echo, is back for a school project aimed at documenting an event in the 1870's that may have lead to the town's current state. He's joined by five friends, who grew up with him in Echo, taking the chance to have a little reunion. Unfortunately, Chase begins to realize that their memories of Echo may have been a bit rose-tinted. Being back in the town digs up old and painful memories; secrets that lead to rifts in the group that have been boiling under the surface for years.
Fate/stay night: Heaven's Feel II. Lost Butterfly
Fate/stay night: Heaven's Feel III. Spring Song