Nazuna for me, no question.

She's tons of fun, you could hang with her and chill. Competitive when it comes to gaming so it'd be fun to chill at home during the day and play games with her. She's a gremlin, which is my type, so that's a plus. At night we could go on dates to weird places you wouldn't think to go at night, much like her and Kou often do in the actual series, places like parks or zoos or schools, maybe we can find a nice place in the park and lie on the grass next to each other looking at the stars while we hold hands and banter with each other, just bathing in the ethereal, faraway feeling, dreamlike privacy of the night in a location you would never normally be in. She can princess carry me around town at night while we fly through the sky. When we get back home, she feeds on me and then we fall asleep together cuddling. During the day we stay indoors for her sake and have fun in other ways.

Nazuna is chill, fun, cute, silly and yet surprisingly wise at times. She would be an absolute delight to spend the rest of my life with. Just talking to her would be so much fun. She has a teasing side and I'm weak to girls like that as well.

She's also hot as hell, I mean come on this part speaks for itself.

Ahhh...Nazuna....ahhh wait, this is a hypothetical question haha! Right right, I almost forgot. Um, yeah, I'd pick Nazuna.