Mother Miki was utterly exhausted from her monotonous daily routine. As usual, when she returned home from work, she collapsed onto the floor, her weary body giving in to sleep. It was her eldest son, Tomoya, who found her like that. On his usual way back, he saw his mother lying defenseless and asleep, and he could no longer suppress the rising emotions deep within his chest. In that moment, an intense, unprecedented impulse awakened in his heart.