Ani To Imouto No Shitai Shitai Shitai Koto兄と妹のしたいしたいしたいコト ; Brother and Sister Doing What They Really Want to Do ; Shishishiko ; Брат и сестра делают то, что действительно хотят ; Брат та Сестра й дійсно витворяють усе, що в голову взбреде ; 오빠와 여동생이 하고 싶은 하고 싶은 하고 싶은 것
Moriyama Kouta was once an unsuccessful adult manga artist. Due to lack of popularity, he was even on the verge of going out of business.
But one day he became a very popular author with vividly realistic and charming portrayal of his heroines.
The reason for the sudden change in style was that Kouta has taken his younger sister Shizuku as his model......?!