Kou’s comment about falling in love with Nazuna “no matter how many years it takes” is met with the reaction it is because there’s a rule he hasn’t been told about: once their blood is sucked, a human only has one year to become a vampire. If they can’t by then, they’ll never become one.
Nazuna cheekily pretends she forgot to tell Kou this, then conveniently remembers the debt she owes him for working on Kiyosumi, and kisses him right in front of the other vamps before flying off into the sky. Kou tells Nazuna that he realizes she’s weird even for a vampire, but he’s glad he met her first.
That said, this new time limit is concerning, and it takes Akira spelling it out that after that year is up and he’s not a vampire, he’ll be killed to protect their secrets. Later, at school, Akira comes across Seki Mahiru sleeping at the top of the steps, zonked out from being, you guessed it, out all night.
We learn that Mahiru, who befriended everyone, befriended Akira and Kou when they were all little. That said, neither Kou nor Akira realized that they were actually friends with him, due to his gregarious nature. Speaking of gregarious, Kikyou Seri greets Kou again one night, and while he tries to run, she promises she won’t kill him, and only wants to start off on the right foot.
When Kou demonstrates his middle school innocence regarding romance, she can’t help but serve as his love coach, and suggests he kickstart his relationship with Nazuna by taking her on a date. Naturally, when Kou proposes this, Nazuna isn’t interested, and continues playing her video games. But Kou switches her PSOne off and insists.
The date plan Seri drew up for him would probably work for most couples, but Kou and Nazuna aren’t most couples. Nazuna won’t even pretend to be able to stand the romcom movie they go to, while at the café Kou tries to start a conversation about the movie even though he knows she hated it.
Nazuna suspects someone put an idea in his head, and after reading Seri’s list she snatched from him, decides this is all lame and goes home. Kou lies in bed forlorn, but soon Nazuna taps on his window, not liking how the evening almost ended and suggesting they at least get that bite with a night view.
Naturally, that means one of their patented late night flights, and the “meal” ends up being one-sided, as she sinks her fangs into him in midair for the first time. Nazuna tells Kou that he doesn’t need to over-plan or overthink; they’ve already been going on dates, and she’s enjoyed them. Her attitude makes me encouraged that Kou can indeed become a vampire within the time limit.
Another night becomes a reunion of Kou, Mahiru and Akira when Mahiru spots Kou while hanging out late at night with other peeps. Kou is surprised Mahiru recognized him, but Mahiru says of course he did; they’re friends. The two proceed to get very corny about their feelings when Akira joins them and asks that they please stop. It’s a fun and wholesome all-human interaction.
Mahiru bids the other two farewell as he must meet someone he’s come to like. Nazuna, while looking for Kou, happens to spot him walking hand-in-hand with a lady, and when Kou arrives, she decides that they should hold hands too, with the practical excuse of not losing track of one another.
While Kou idolizes Mahiru as a “perfect” person (his family even owns a flower shop!), it’s Kou who encourages Mahiru to continue his nightly pursuit of love with the story of how he’s been hanging out with his own late night lass. I love how the episode ends with a super wide shot looking straight down at the two couples walking in opposite directions while both experiencing happiness.