隣の席のヤンキー清水さんが髪を黒く染めてきた (Associated Names)

[Shimizu-san, you dyed your hair black.]’ [Ah, yes.]’ [Why did you dye it all of a sudden?]’ [Because…yesterday…]’ Shimizu-san, who sat next to me and had dyed her hair from blonde to black gradually lowered her voice, slightly blushed, and laid her face down on the desk.