Toru Shiina, a high school student, stumbles upon a peculiar discovery in his dorm room closet – a portal to a vast dungeon resembling a video game. Delving to its depths, he is astounded to find his long-lost younger sister, A-chan, who vanished in their youth, peacefully resting beneath a towering tree. Embracing their newfound roles as dungeon masters, Toru and A-chan nurture the dungeon's evolution together. As Toru ventures back into the enigmatic dungeon to reunite with his supposedly deceased sister, the mysteries and challenges that await him remain uncertain. Amidst moments of elation and sorrow, this tale unfolds as a pursuit of fleeting moments of happiness amidst the unknown.
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