Megami no Sprinter

Takase is almost the opposite of his brother weak and bad at school He recently moved in at his brothers house who is a married guy He is placed under an exceptional coach to improve his physical health and the coach also known as Venus of Track is none other than his sisterinlaw She is developing a new technique to improve at a faster rate by managing testosterone levels in the body in other words sexual desire management She calls it absolute obedience And Takase has to go under it to improve himself