Note: Published in Comic Market 91, COMIC1☆11, Comic Market 93

1. Ikumonogakari (いくものがかり) 
2. Ikumonogakari Deluxe Ban (いくものがかりデラックス版) 
3. Ikumonogakari Deluxe Ban 2 (いくものがかりデラックス版2) 
4. Ikumonogakari Deluxe Ban 3 (いくものがかりデラックス版3) 
5. Ikumonogakari Jibun de Shite Miyou Hen (いくものがかり 自分でしてみよう編) 
6. Shoujo ga Kaeru Machi (少女が買える街) 
7. Shoujo ga Kaeru Machi 2 (少女が買える街2) 
8. Shoujo ga Kaeru Machi Kawareta Ojousama-hen (少女が買える街 買われたお嬢様編)

Japan has entered a society with a seriously declining population. 
The "Ikumono-gakari Law," enacted as a countermeasure to the declining birthrate, makes sexual intercourse obligatory, and boys and girls learn sexual acts at school. 
However, the young boys and girls are so excited by the sex acts, even though they are in class, that they gradually escalate the situation... 
They let their sexual desires take over, and the orgy begins!

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