A boy living in an apartment complex in Tokyo has been very interested in the presence of the busty mature woman "Miki" who lives next door. When he thinks of "Miki", his crotch tingles. The men in the neighborhood cast passionate glances at her firm, mature-womanly breasts. The boy spends sleepless nights wanting to know what's inside them. One day, he ends up alone with "Miki". His mother, who is an acquaintance of "Miki", is returning to her parents' home, so the boy ends up being left at "Miki's" house. Alone with that sexy "Miki"...