建築業界で働く柏木は現場で怪我をしてしばらく市内の病院に入院する羽目になった。やる事もなく悶々と過ごしていたある日、学生時代の同級生であるアキラと、その奥さんのかんなちゃんがお見舞いに来てくれた。「怪我は大丈夫？柏木君」「何かお手伝い出来ることあるかしら」そう微笑み優しく世話をしてくれる「同級生の妻」の何とも言えない甘美な色香に、入院生活で溜まりまくっていた柏木の肉棒は不謹慎にも勃起してしまい…。

Kashiwagi, who works in the construction industry, was injured on a job site and ended up hospitalized in a city hospital for a while. One day, while he was feeling restless and with nothing to do, his former classmate from college, Akira, and his wife, Kanna, came to visit him. "Are you okay, Kashiwagi-kun?" "Is there anything I can do to help?" The indescribable sweet allure of his "classmate's wife," who smiled and took care of him so kindly, caused Kashiwagi's penis, which had been pent up during his hospital stay, to become inappropriately erect…