Reader x Garten of ban ban characters

Your arrival has begun.

Recently, you've been told about the new kindergarten in town called, 'Ban Ban's Kindergarten'. It closes at night around 10:00pm and that's when no one can enter. Curious to know why, you snuck into the kindergarten at night and inspected every single room you could find, but there were some suspicious rooms. You soon realized that this was not a normal kindergarten. These monstrous creatures will change their behavior every single night, and you can only experience that behavior if you sneak in this kindergarten. Without a reason, you were trapped inside this mysterious place, to only be given a task to stay away from the beasts who were known for killing, but then they start to fall in love with you.... and act kinder? It doesn't matter anymore, you wanted to see their attitude now, and here's your chance. So, will you survive this almost romantic experience, and see what happens at this dark night?

Cover art is mine and this could include smut or fluff.