The Tunnel to Summer, the Exit of Goodbyes

Takahara Hairi never expected summer to feel like a dream. Sent to Torishirojima Island to sort through his late grandmother’s belongings, he’s met with endless sea, quiet nostalgia, and mysterious girls, each chasing something just out of reach. As he settles into island life, lost memories begin to surface and he finds what he never knew he’d lost.

The story centers on a boy named Kazuki Tsukigase, who transfers to a high school on a remote island to get away from anyone who knows him. Kazuki finds out that there is an inlet on the island where people are rumored to disappear. Exploring the inlet, he encounters an unconscious girl. When she comes to after Kazuki takes her to the clinic, she is unable to give out anything about her identity except that she is named Nao, is 16 years old, and whispers the year "1974."

Yuuta was 12-year-old boy, who had lost his father in the traffic accident one year ago. In the summer vacation, he visited a deserted dam deep in the mountains, where he had a good time with his father before. Suddenly a thunder storm occurred and he slipped on the ground. He lost consciousness and woke up to find a girl and an unfamiliar village. He time-traveled 30 years and reached a village, which sank at the bottom of the dam. This is Yuuta's precious memory of "another" summer vacation.

Yuna Ichihara's spring break is far from pleasant, especially after she sends off her best friend Sacchan, who is moving away. But while heading home, the timid girl brightens up when she encounters a boy who looks exactly like her first love—a prince from a shoujo manga. Subsequently, she finds herself in a peculiar situation with the mature Akari Yamamoto, a new neighbor who immediately befriends her. Now attending the same high school together, Yuna shows interest in Akari's brother Rio—the same mysterious and handsome boy she met during spring break. Likewise, Akari is falling for Yuna's carefree childhood friend, Kazuomi Inui. However, love is not at anyone's fingertips, as the relationship between these four contrasting friends faces complications, preventing them from moving forward. To discover the truth between them, they will need to confront their own struggles and uncover secrets hidden among themselves.