The Tunnel to Summer, the Exit of Goodbyes: Ultramarine by Mei Hachimoku. A Romance manga rated Teen, published in English by Seven Seas.
Rumor has it that the Urashima Tunnel ignores the rules of time and space: walk through it and you'll find your heart's desire, at the cost of years of your life. When Kaoru Tono stumbles on a tunnel that matches the story, he can't stop thinking of his little sister Karen, who died five years ago. Then new transfer student Anzu Hanaki follows him and offers to help him explore it. A bittersweet sci-fi romance.
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