サマータイムレンダ [Summertime Render]

When a young man returns to his remote island hometown for a funeral, he discovers that death is not the end—it's a loop. Summertime Render, published by Shueisha from 2018 to 2021 across 13 issues, is a taut, time-loop thriller from creator Yasuki Tanaka that blends supernatural horror with a desperate race against a shadowy doppelgänger threat. Its tight, self-contained story and mind-bending twists have made it a standout in modern manga.