Tsuma Netori Rei: Boku no Ayamachi Kanojo no Sentaku

Synopsis...

Akafumi is preparing breakfast. His wife Makoto, who was eating, sees the time and rushes off to work. It seems that she is busy these days helping her senior teacher, Yasuno. That afternoon, Takafumi is summoned to the principal’s office. It has always been his dream to open his own shop, but a few days ago he found one through an intermediary, and the school principal, Shiraishi, has even offered to invest in it.
At the principal’s office he is told to come to the shop this weekend to prepare for the opening. Then, one weekend morning. Makoto is worried that she will be away for a few days and will stay at school late helping Yasuno-sensei, but Takafumi convinces Makoto that Yasuno-sensei will be fine. That afternoon, Makoto, who was still working in the teachers’ room, receives a message from Takafumi.
“The other party’s impression of me is also good. I’ll tell you about it tomorrow when I get back.” Makoto is responding to the sentence when Yasuno appears with a cup of coffee. Makoto drinks the coffee Yasuno hands her, but after a while she faints. Yasuno looks at Makoto’s body on the ground with a disgusting smile.