Chapter 1 - Expressionless People and Emotional People

Synopsis
The chapter starts with introduction Kashiwada by the Narrator. The narrator is either Sada or some other character, since Oota is referred to in third-person. When Oota is questioned, he gives his backstory on meeting Kashiwada. Apparently she didn't react to getting pooped on by some birds, so he wanted to get a reaction from her. The chapter ends with Oota trying to give Kashiwada Vinegar to drink, but she notices and instead Oota ends up drinking it. Kashiwada then tells Oota she likes that part of him, with Oota denying this as anything other than payback.