By the time the MC fell for his underclassman, Yuki Nishimura, she had already gotten herself a boyfriend. Trying to forget about her, he tries to date other women, but it just never seems to work out. Tired from everything, the MC decides to go on a hot springs trip but Yuki suggests to tag along...
 
(Source: Fakku!)
 
Note: A live-action AV adaptation (CAWD-030) was released on November 25th, 2019.

1. Kouhai Tanetsuke Onsen: Nishimura Yuki-chan ni Marking (後輩種付温泉～西村ユキちゃんにマーキング～) 
2. Kouhai Tanetsuke Onsen Gojitsudan: Nishimura Yuki-chan no Daigaku Seikatsu (後輩種付温泉 後日談~西村ユキちゃんの大学生活~) 
3. Marie-san to Onsen e: Otonari no Kyonyuu Onee-san to Kazokuburo de... (マリエさんと温泉へ～お隣の巨乳お姉さんと家族風呂で…～) 
4. Marie-san to Ofuroba de: Otonari no Kyonyuu Onee-san to no Amai Hibi... (マリエさんとお風呂場で～お隣の巨乳お姉さんとの甘い日々…～) 
5. Deisui Haitoku Onsen: Shufu Shinohara Yukie-san no Hiasobi (泥酔背徳温泉～主婦・篠原雪枝さんの火遊び～) 
6. Deisui Haitoku Onsen Gojitsudan: Shufu Shinohara Yukie-san no Atoshimatsu (泥酔背徳温泉 後日談~主婦・篠原雪枝さんの後始末~) 
7. Furin Takuran Onsen: Sakaki Taeko-san no Hinichijou (不倫托卵温泉～榊妙子さんの非日常～) 
8. Furin Takuran Onsen Gojitsudan: Sonogo no Taeko-san (不倫托卵温泉 後日談~その後の妙子さん〜) 
9. Seiai Onsen Kemono-tachi (性愛温泉の獣たち)

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