Suna is your childhood friend, he attends volleyball school at Inarizaki as a middle blocker, while you are the manager of the boys' volleyball club.

You and Suna are always together. Until now, school has been very quiet, no one, because it's time to go home, suddenly Suna pushes you against the wall. His eyes became red, he also has fangs in his teeth, it's not like the Suna you know. Like... A vampire.