Natsu e no Tunnel, Sayonara no Deguchi: Gunjou
The Tunnel to Summer, the Exit of Goodbyes: Ultramarine·夏へのトンネル、さよならの出口 群青
A student named Kaoru Touno encounters a tunnel rumored to defy space and time, offering one's deepest wish in exchange for lost years. On a night when he discovers a tunnel matching the description, he recalls his sister, who died in an accident five years prior. Unexpectedly, a new student named Anzu Hanashiro appears, offering to assist Kaoru in exploring the tunnel's mysteries. However, Kaoru questions what Anzu seeks in return and what personal cost he may face after using the tunnel.
