A new coach, Hanamiya, joins the weak baseball team with only two members and help from other players! The two members doubt Hanamiya's abilities, but after a perfect hit in a three-ball game, the team is astonished. Coach Hanamiya begins to train and coach the team thoroughly. However, it's not just the usual training: he strips into swimsuits in front of the two to check their form!? A secret training that dramatically improves their form!? Hanamiya can't help but get an erection when the two get it...