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My Elder Sister is the Universe
お姉ちゃんは宇宙。
A young boy looks forward to summer visits at his grandparents' house, where he can spend time with his older cousin Aoi. He has always admired her, calling her his "older sister," and this year he finally gathers the courage to confess his feelings.
What begins as a simple confession leads to an intense and passionate summer together. The two share intimate moments, creating memories that will last a lifetime as their relationship deepens in the heat of the season.
