In Japan, "mama-katsu" is a colloquial term for the reverse of "papa-katsu". It involves:

Women provide "favors" or allowances to younger men.

The series typically consists of multiple segments or "episodes" that follow Yoshiya's encounters:

The story centers on , a young man who developed a complex toward older women due to being spoiled by his sister, Kyouko. Over time, he hones his ability to seduce middle-aged women, specifically targeting those who may be neglected or seeking excitement.

For the women involved, it is often seen as a way to alleviate boredom or loneliness within a marriage.

Introduces Yoshiya’s motivations and his initial success in infiltrating the lives of mature women through tutoring or local social connections.