After wanting to try out sex for the first time ever, Riko chooses her brother to gain her first experience. 
Note: Published in COMIC ExE 06

1. Kono Bijutsubu ni wa Mondai ga Aru Rashii (この美術部には問題があるらしい, The art club has a problem); Comic ExE 20
 2. Kono Suieibu wa Chou Jiyuu Rashii (この水泳部は超自由らしい); Comic ExE 22
 3. Houkago Saimin Jikken (放課後催眠実験); Comic ExE 21
 4. Otaku de Inkya no Ore ni Naze ka Guigui Kitaru Joshi ga Iru Ken (オタクで陰キャの俺に何故かグイグイ来る女子が居る件); Comic ExE 18
 5. PVP; Comic ExE 10
 6. P.G.; Comic ExE 07
 7. ◯ wa x wo Taisetsu ni Surubeki darou? (◯は×を大切にするべきだろう？); Comic ExE 06
 8. Okaa-sama Ikemasen! (お母様イケませんっ！); Comic ExE 02
 9. AVP; Comic X-Eros #26
 10. Otouto no Osewa Suru no wa Onee-Chan no Sekinin yo ne♥ (弟のお世話するのはお姉ちゃんの責任よねっ♥); Kakioroshi

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