ひょんなことからオナニーし合う友達、通称【オナトモ】になった僕と山田さん（柏木こなつさん）。ある日、憧れの藤崎さん（逢沢みゆさん）にそのことがバレ、なんと藤崎さんもオナトモの仲間入りをすることに！しかし藤崎さんの膣でオナニー『相互挿入オナニー』をきっかけに、気まずい関係に…人気同人作品とコラボ！原作同人作品はこちら！「オナトモ。 僕の部屋がクラスの女子のオナ部屋になった話。2」「オナトモ。 僕の部屋がクラスの女子のオナ部屋になった話。3」
By a twist of fate, Ms. Yamada (Konatsu Kashiwagi) and I became “masturbation buddies”—or “Onatomo,” as we call it. One day, Ms. Fujisaki (Miyu Aizawa), whom I’ve always admired, found out about it, and to my surprise, she decided to join our group! However, after we tried “mutual insertion masturbation” using Ms. Fujisaki’s vagina, things got awkward… A collaboration with a popular doujin series! Check out the original doujin series here! “Onatomo: The Story of How My Room Became the Class Girls’ Masturbation Room. 2” “Onatomo: The Story of How My Room Became the Class Girls’ Masturbation Room. 3”

– JavGG.net