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When 23-year-old Hirose Anna finds out that her little brother masturbates with her dirty underwear, she decides to take things a step further by allowing him to see her do naughty things as well. Each time the situations escalate until she comes out and tells him that as his big sister she will take responsibility for his sexual curiosity. She allows him to do anything with her except for proper sex; yet as his requests get dirtier each time, she remains determined to take responsibility and keep things going no matter what. (Source: ANN, modified at BakaBT)

OVA - Feb 17, 2012
7,340 5.46
Anime adaptation of the original project by a PC adult game developer, SPEED.

OVA - Sep 20, 2013
3,305 6.08
In the year 22XX, due to the drastic decrease in the human population, the government starts accepting races from other allied planets. As a result of genetic mixing, new species are born with special powers. A young man named Yuuki learns on his 18th birthday that while his father is a member of the "hero" tribe, his mother is a member of a tribe of beings who can manipulate plants who were supposedly wiped out due to the accelerated mechanization of the planet. As a result, Yuuki holds powers of both tribes, but he questions which side he should help with his powers. (Source: ANN)

Movie - Mar 14, 2020
458 N/A