Koumi-jima Shuu 7 De Umeru Mesu-tachi =link= -

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The story follows , a high school teacher who has a penchant for visiting remote islands. Despite his mundane profession, Seiichi harbors a physical trait—significant sexual stamina—that he feels is underutilized in his everyday life. koumi-jima shuu 7 de umeru mesu-tachi