Taro, a son who is on the verge of being crushed by the pressure of his father wanting him to get into medical school, finds solace in his kind mother. One day, Taro is found out by a Kokoro who lied and said he's not a virgin to show off, and is bullied. Determined that she is the only one who can save her beloved son, his mother begins to give him a secret sex education that she can never tell her strict father about, but...