Kotoši no nacu wa kowaku nai (S01E09)

Ikeda Chizuru... Chitose's younger twin sister...Despite the summer heat, my sister diligently performs her student council duties without a single complaint. I knew she could do it. She's amazing. As usual, she works with Sugiura-san. No matter how hot it gets, they're always together... (drool) Oh, my sister's laughing happily with Sugiura-san... (gush)...Hm? ...She's back again. Why does she always interfere with my sister and Sugiura-san... Don't come over here! Blow yourself up! (Crunchyroll)