Since our parents divorced, I spent more time with my younger sister. For me, Yui is still like a little baby. I have to be able to replace the position as a father and take care of Yui. However, over time, I feel insane. Every night I do something pervert to my own sister when she sleeps. I understand we are siblings, but I can't help it.... 
 
(Source: Translated and Edited from Nekopoi)

1. Oyasumi Sex (おやすみせっくす); 2014/5/5 
2. Oyasumi Sex am2:00 (おやすみせっくすam2:00); 2014/8/17 
3. Oyasumi Sex am3:00 (おやすみせっくすam3:00); 2014/12/30 
4. Oyasumi Sex am1:30 (おやすみせっくすam1:30); 2015/5/5 
5. Oyasumi Sex am4:00 (おやすみせっくすam4:00); 2015/8/16 
6. Oyasumi Sex am4:30 (おやすみせっくすam4:30); 2015/8/16 
7. Oyasumi Sex am10:00 (おやすみせっくすam10:00); 2023/3/2 
 
Oyasumi Sex: Soushuuhen (おやすみせっくす総集編); 2016-12-31 
8. Natsuyasumi Sex (なつやすみせっくす)

This entry includes the following chapters:
 
1. Oiwai Sex: Onii-chan no Tanjoubi (おいわいせっくす ～お兄ちゃんの誕生日～) released at Comiket 94, later one included in Otomari Sex Omnibus from Comiket 97. 
2. Oiwai Sex 2: Imouto no Tanjoubi (おいわいせっくす２〜妹の誕生日〜) first released online in FANZA and bundled with Oazuke Sex in Comiket 95, later one included in Oyasumi Sex Omnibus from Comiket 97. The setting happens after Oazuke Sex. 
3. Oiwai Sex 3: Onii-chan 20-sai no Hi (おいわいせっくす 3 ~お兄ちゃん20歳の日~) first released online in FANZA, later one included in AQUADROP omnibus from Air Comiket 2. The setting happens after Oyasumi Sex AfterGrowth.

1. Otomari Sex (おとまりせっくす); Comiket 93 (2017/12/31) 
2. Otomari Sex 1.5 (おとまりせっくす1.5); COMIC1☆13 (2018/4/30)

Akira Tsukioka