Shiori and Tatsumei were bound by a deep connection, despite being mother and son. Even after he started working, their warmth toward each other never faded, and the bond they shared in daily life was truly remarkable. However, Tatsumei gradually developed romantic feelings for Shiori, and could no longer see her merely as family. Yet, bound by their familial relationship, he could not bring himself to confess his love. His hidden emotions continued to grow silently, tormenting him each passing day.