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「他の男とセックスしてほしい」そんな夫の願いを妻・満里奈は最初拒否するも、熱意に負けて一度だけなら……と了承する 。最初は1回だけの約束だったが、徐々に“ネトラセ”の魅力にハマっていく満里奈たち……。「DLsite 美少女ゲーム」はエロゲー・エロアニメ・アダルトアニメのダウンロードショップ。お気に入りの作品をすぐダウンロードできてすぐ楽しめる！毎日更新しているのであなたが探している作品にきっと出会えます。国内最大級の二次元総合ダウンロードショップ「DLsite」！

A "netorase" play—where a husband lends his wife to another man. It had been about a year since Kenji, the husband, had lent his beloved wife, Marina, to a former adult film actor. Over time, Kenji began to feel an even stronger desire: he wanted to see Marina willingly cheat on him, driven by her own desires. Then, one day, Marina received a message from her ex-boyfriend—the first contact in over a decade. He wanted to rekindle their relationship, with marriage as the goal. Marina, of course, turned him down. But when Kenji heard about it, he confessed the darker, more forbidden desire he’d been harboring: "I want you to get back together with your ex." This was different from before. This time, it would all be Marina’s choice—a relationship she entered willingly. As her ex continued to pursue her, determined to win her back, Marina found herself at a crossroads. What would she do—? [Translated from dlsite]

The protagonist, Marina Morishita, had just broken up with her high school boyfriend after being unable to put up with his selfish behavior. At that time, she became friends with an older man on the Internet and soon decided to meet in person. For Marina, who had only ever known relationships between students, this encounter was fresh and exciting. She was attracted to him the moment they met, and made various approaches to become intimate. One day she mustered up the courage to invite him to a love hotel, where she experienced incredible and tireless sex for the first time. Marina

After graduating, Marina starts working as an office clerk at a construction company. Around the same time, a new part-time employee, Tsutsujimori Shou, joins the team. The two quickly grow close, and when Shou confides in her about his lack of confidence, feelings start to blossom between them. Before long, they’re in a relationship. Marina, using the techniques she learned from her ex, takes the lead in teaching Shou, who’s still a virgin. Sneaking around at work or meeting at hotels, the two grow more and more entangled. Marina finds herself drawn to Shou, who’s completely different from her ex. Thanks to her “training,” Shou gradually gains confidence in himself. But… their relationship takes an unexpected turn. [Translated from dlsite]