Note: Published in Comic Happining Vol.4

1. Ofuroba Daimondai Koudou (おふろば♨大問題行動, Misbehavior at the Bath House); Comic X-Eros #65 
2. Honjitsu wa Zenra Toukoubi!? (本日は全裸登校日!?, Today’s Birthday Suit Day!?); Comic Happining Vol. 3 
3. Danjo Pair de Yarou!: Zenra-gumi Taisou (男女ペアでやろう!全裸組体操, Naked Gymnastics: Let's Do It In a Male and Female Pair!); Comic Happining Vol.1 
4. Danjo Pair de Yarou!: Zenra-gumi Taisou Guidebook (男女ペアでやろう！全裸組体操ガイドブック, Let’s Form Boy-Girl Pairs! Naked Gymnastics Guidebook); Comic Happining Vol.2 
5. Ouchi de Yarou! Zenra-gumi Taisou (おうちでやろう！全裸組体操, Try Them At Home! Naked Gymnastics); Comic Happining Vol.4 
6. Best Couple Contest (ベストカップルコンテスト); Comic X-Eros #80 
7. Run! (RUN！); Comic X-Eros #53 
8. Hatsu Date no Kimi to, Hatsu Ecchi no Kimi to (初デートの君と、初エッチの君と, Our First Date, Our First Sexual Experience); Comic X-Eros #77

Approved by the Naked Gymnastics Association
 
(Source: Fakku!)
 
Note: Published in Comic Happining Vol.2

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