The main character helps out at a relative's hot spring hotel during winter vacation. One day, he runs into a big-breasted customer in an open-air bath outside of business hours. This is a book about squeezing out the breast milk accumulated on a long trip, drinking breast milk after taking a bath, and enjoying breast milk to the fullest.
 
(Source: Toranoana, translated)

1. Shuugakuryokou Yarinaoshi (修学旅行やり直し); Comic ExE 25 
2. Itsumo Konna Kanji (いつもこんなかんじ, Always Like This); Comic Market 98 
3. Onekatsu no Susume (おね活のススメ, The Big Sister Experience Recommendation); Comic Market 94 
4. Onekatsu no Susume! (おね活のススメ！, The Big Sister Experience Recommendation!); Comic Market 97 
5. Kashikiri Pai Onsen (貸切パイ温泉, Exclusive Boobs Hot Spring); Comic Market 96 
6. D-SCALE; Comic Market 95 
7. Boku no Su sana Hito. (僕の好さな人。); 
8. Gensen Oppai Kakenagashi (源泉おっぱいかけながし, Natural Boobies Hot-Springs); Comic Market 93 
9. Amatoro Oppai ♥ (あまとろおっぱい♥, Sweet n’ Sticky Boobs ♥); Comic Market 92 
10. Oppai no Jikan♥ (おっぱいの時間♥, Titty Time♥); Comic Market 91 
11. Pai Shota Milk (パイショタみるく, Boobies, a Shota & Milk); Comic Market 90

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