
Note: Chorokawa is word combining the adjectives choroi (simple-minded/easy to please) and kawaii (cute), the joke involves her surname Chiyokawa sounding close to it.
自分ではツンツンしているつもりのチョロカワさん / Jibun de wa Tsun Tsun shiteiru Tsumori no Chorokawa-san / Miss Simple and Cute Thinks She Is Being Prickly / Chorokawa-san Who Believes She Is a Tsundere.