After the tiring amount of work that Haruto was forced to endure for one singular bath as a bar of soap, he had finally managed to reach peace. He, as an isekai main character, was used to sitting alone in dark areas late at night.
Haruto: "I've never really been one for hot springs like these. They're usually too far away, and aren't always enjoyable if you get there, but being here late at night really brings out the charm. It reminds me of an abandoned parking lot at 4AM. There's a looming feeling of... Tumblr posts."
Haruto shivers at the thought. With his Hivemind skill on cooldown, he and his brilliant mind were left to their own devices.
Or so he had hoped, at least. Like an eternal prophecy passed down from generation to generation, the story of this world has a path set in stone for him.
The moment Haruto had adjusted to the comfort of the bath house, the door slams open with a wall of steam flooding out. This smoke reveals the silhouette of yet another fantasy babe. Although, with a body as childish as hers it's likely morally dubious at best to refer to her as a baby.
That's right, ladies and gentlemen and bars of soap! Let's get a round of applause for... THE CHILD- sorry, THE ACTUALLY 720 YEAR OLD VAMPIRE SUCCUBUS!
Haruto: "Isn't it, like, midnight here? Why the hell is this girl barging into the bath house in the middle of the night?"
Haruto questioned her decision, clearly oblivious to the fact that vampire succubi lolis do not abide by the rules of neither curfews nor trespassing laws, and as a free sign-up bonus, public decency laws as well.
Vampire Girl: "These humans and their odd inventions… towels? Who's ever heard of those?"
From the dark corner containing Haruto's fresh, new, and radically hip soap purgatory, he could barely make out shining, golden twintails, the mark of any mature and graceful womanly woman, amongst the steam that had somehow not subsided by then.
Haruto was an almost immediate fan. Had he a mouth, it would be screeching something about one "Rudeus Mushoku" and nothing wrong being done. Thankfully, the planet had wished mercy on its inhabitants just this once. Regardless, his non-existant eyes had popped out of his skull ogling the shadow of a prepubescent girl at this point and it was time she finally come out to greet the water.
In a flash, Haruto was immediately blinded, likely smited spiritually by the police for his crimes. He begged and pleaded to nobody at all for him to please see the kid already. The air was not pleased to sense this in his thoughts and he was mentally smited again.
Vampire Girl: "Oooh, it's all tingly. I've never seen any soap quite like this!"
The girl continued making frivolous comments about the quality of the soap until she eventually finished her short and relaxing morning bath about 6 hours later. Haruto admirred her clear interest in the artform. After her relaxing looked around, and unsurprisingly, there was nothing stopping her from becoming the greatest thief of the century.
She threw Haruto across the bath with her epic vampire powers just softly enough that the soap didn't disintegrate on impact with the wall. After a nanosecond of making sure the soap was fine and tossing her signature gothic, frilly black dress on, she took Haruto once more and flew out the door, ironically, like quicksilver toward the massive castle peeking over the misty mountain just beyond the capital city.