Minato has a secret. He desperately wants Yukari to do buttstuff with him. Except not in the usual fashion. Well, he wouldn't say no to exploring her butt, of course, but what he really wants is for her to explore his butt. Terrified, he tells her his secret. Will she be willing to try, or will she refuse and get mad at him for asking such an embarrassing, gross thing?
... You get three guesses, and the first two don't count.
Both Arisatos survived the crash. Thanks to Hamuko's presence, Minato actually has feelings. They must balance high school shenanigans with fighting eldritch horrors at night using the power of friendship. NOT a novelization. Things will go off the rails before long.