Baku Ane!! Otouto Ippai Shibocchau zo!

After a traumatic experience causes him to fail during his first intimate encounter with his lover, a young man finds himself struggling with his confidence. His older sister and cousin step in, offering to help him overcome his trauma through a series of sexual lessons. As they take charge of his rehabilitation, the situation becomes more complicated when the very person who caused his trauma also joins in. What begins as a family intervention soon turns into a competitive contest among the older women, each vying to be the one to help the younger brother reclaim his prowess.