mother and child mating [Kuroji ...] winter.

A widow who lost his husband in an accident two years ago. She lived with her husband's son, Makuro. Makuro left college because his father died and did not find a job, but now he is half-deprived. Because he was worried about such a makuro, Yu continued to take care of Makuro. However, it is a precedent. Both Makuro and Yu were aware of each other as heterosexuals before the birth of her husband (father). Now that her husband has passed away, she likes Shinkuro because he doesn't leave home. One winter day, Yu invited Makuro to go on a two-person hot spring trip in the name of change of mind.