Takafumi was preparing breakfast when his wife, Makoto, who was already eating, glanced at the clock and ran out to go to work. Lately, she had been busy assisting her superior, Professor Yasuno.

That same afternoon, Takafumi was called into the principal's office. Takafumi's dream had always been to open his own business, and a few days ago, thanks to Yasuno's mediation, he found a location. Additionally, the academy's principal, Kanako, decided to invest in the project. In the principal's office, he was informed that he needed to start preparing for the store's opening starting that weekend.

The weekend morning arrived. As Takafumi got ready to leave, he told Makoto that he would be away for two or three days. Makoto, who would be staying late at the academy helping Yasuno, felt uneasy. However, Takafumi reassured her, saying she didn't have to worry because Yasuno was a trustworthy person.

That night, while Makoto continued working in the teachers' lounge, she received a message on LINE from Takafumi:

"We're almost done here. The feedback from the other side has been very positive. I'll tell you everything in detail when I return tomorrow."

While she was replying to the message, Yasuno appeared with a coffee. Makoto accepted the cup he offered, but shortly after drinking, she collapsed on the floor. Yasuno, with a lewd smile on his face, watched as Makoto lay unconscious on the ground...