Orimoto Masao lost his father at a young age and was raised alone by his mother, Yoshimi. Over time, Masao began to see his mother as a woman rather than just a parent. He cherished their time together, dreaming of their intimate bond. But one night, returning home earlier than expected, Masao discovered Yoshimi in their room with a man—supposedly back late from a class reunion. Unaware they were being watched, the two gave in to their emotions. Witnessing the scene, Masao was overwhelmed with bitter frustration. If his mother was going to belong to someone else, he thought with a stabbing pain in his chest, then he would make her his.