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)

"Was their trip to the hot springs just a one-off?"
 
"How does Ms. Marie really feel about him?"
 
With these questions plaguing his mind, the MC meets Ms. Marie at her house for dinner.
 
Sometimes having an older partner makes you feel anxious and insecure. Bifidus does an amazing job to capture these feelings.
 
(Source: Fakku!)

Taeko's husband is caught in an affair, and she goes on a hot spring vacation to take her mind off her woes. When she meets a boy who's able to please her like her husband never could, one night just isn't enough, and a chance encounter develops into a long-lasting and passionate tryst... 
 
(Source: Fakku!) 
 
Note: A live-action AV adaptation (URE-062) was released on January 25th, 2021.

Yukie Shinohara, a housewife, decides to use a hot spring vacation as an opportunity to vent her sexual frustration by finding a boytoy to fool around with. However, once the drinks start pouring, she starts getting sloppy, and what started out as a bit of fun might end up being more than she bargained for.
 
(Source: Fakku!)
 
Note: A live-action AV adaptation (URE-080) was released on June 28, 2022.

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.

It's been a few years since they first met, but the MC's busty next door neighbor, Ms. Marie, still treats him like a kid. One day, she wins tickets for a one night two day trip to the hot springs and invites the MC to go with her...
 
"Hot Springs with Ms. Marie" is being turned into a Hentai animation, coming early 2020! Make sure to catch the doujin as well!
 
Strongly recommended for those who love the "older-sister" types!
 
(Source: Fakku!)

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