One sleepless night, Ko slips out to walk the streets. Life after dark is a revelation! Especially when he meets flirtatious Nazuna. Except that she's a vampire. That's okay. He wants to become a creature of the night too. But transformation doesn't come that easily...

Ko's school trip is full of surprises as he forges connections with old and new friends. Kyoko pursues a lead regarding the truth about her father. And Mahiru and Kiku take the final steps in their relationship as human and vampire...leaving Ko with a lot to process.