One afternoon after school, Asahi Kuromine is hit with a shocking revelation - Youko Shiragami, his crush, is actually a vampire. Youko is forced to leave her studies in order to protect her family from her strict father's demands. However, Asahi can't imagine life without her and swears to keep her secret safe. Unfortunately, Asahi has a reputation for being terrible at keeping secrets and always wears his heart on his sleeve. As if that weren't enough trouble, Asahi finds himself caught up in the lives of other supernatural beings, and he's tasked with shielding their true identities. Jitsu wa Watashi wa follows Asahi as he navigates complex relationships while protecting his friends' secrets, all while trying to win Youko's heart.