The Tunnel to Summer, the Exit of Goodbyes

夏へのトンネル、さよならの出口

Kaoru Tono, a withdrawn high schooler still carrying the death of his sister, hears of the Urashima Tunnel, said to grant anything wished for at a price. Transfer student Anzu Hanashiro catches him investigating it and the two team up to test the rumor together. Inside the tunnel time runs far slower than outside, so each minute spent searching for what they want costs them days of their lives in the world they left.