Ki ni Naru Class no Joshi ga, "Ana" o Shiteiru Rashii.

"A slut in a cardboard box appears in an unused room in a certain building." "The cardboard box has a hole on its front side and she shows only lower half of her face through the hole and gives kisses and blowjobs." Having overheard such rumors, a schoolboy Rokurou comes to have a strong desire to see that woman. On the other hand, he also has some feelings for a classmate Mizore Yukishizuku. As he goes to the building repeatedly, he finally faces the truth of that woman...