Okamura Yuuto is an introverted young boy whose father send a relic which can put anybody into an hypnotic state, ready to obey to any suggestion. Disbelieving first, Yuuto discovers that the relic truly has hypnotic power.

Longing for Asagiri Kasumi, his senpai from the same literary club, he crosses the line and uses the relic on her. He starts by extracting personal information, which is how he learns that the rumor about her dating someone is true.

Jealous, he finally decides to make her believe she is his girlfriend when they are alone.