Mother Mari raised her son Taichi as a single parent. Born prematurely, Taichi was nurtured with every ounce of Mari's being—she dedicated not only her entire life but also shared an intimate, physical bond with him, pouring deep affection into their relationship. As time passed, Taichi matured into adulthood, gradually developing his own will and beginning to question whether it was right to rely on his mother for everything. Their monthly mother-and-son-only hot spring trips only deepened these feelings. When Mari realized Taichi's growing doubts during one such trip, she feared losing him and resolved to bind him to her even tighter. Choosing to captivate him completely, she used her own body to ensnare him and reclaim his heart once more.