Hasekura Kohei has transferred school ten times. His new school, Shuchikan Academy, is on an island he lived on for a short period before when he was younger, Tamatsu Island. There awaited him the student council vice-president, Sendo Erika.

Shuchikan Academy's traditional opening ceremony. Kohei is surprised with the student council president's, Sendo Iori's, on-stage performance and the shouts from the students in the audience. The vice president follows and spills the beans on what happened the night before to the all the students, leading Kohei to become the center of attention during the following homeroom. Later, Shiro ends up asking Kohei to help find the escaped rabbit, Yukimaru...

It's a Sunday in June. Kohei and the treasurer, Seiichiro, are swamped with work to complete a plan laid out by the student council president, Iori, "Let's make the opening of the pool exciting." During which, Kohei becomes aware that it is Erika's birthday...

Erika wakes up in her room and is horrified as she remembers what happened last night and the fact that she wanted blood. Meanwhile, the student council, including Kohei, decide to keep watch during the night to figure out if the rumors about vampires going around school are true, but...

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