Welcome to the Classroom of Teaching You a Lesson [Crossover]

Next story on the watchlist: Karasuno High School Volleyball Club, a story focused on Haikyu!!. See the author's profile for details. [Main pairing: him and Eiji. Read with caution.] [Story blurb] [Will you choose "yes" or "no"?] One very ordinary night, a group of little ones who would grow up to become big shots heard these words in their dreams. When the little ones opened their eyes, they found themselves in an unfamiliar classroom. There were only four students, and a big cat stood at the front. Spacey baby: It's been ages since I had such a fun dream. I usually have nightmares about Daddy~ Explosive-tempered baby: Hmph. Even in a dream, I'm the strongest! Gentle baby: Oh, this seems like it'll be fun~ Crybaby: Sob, sob, why haven't I woken up yet? This place is so scary~ [This isn't a dream~] [Congratulations, adorable babies! You've arrived at the Teach-You-How-to-Behave Classroom.] [Let us teach you how to behave and become superior to everyone else.] [Fail to complete the teacher's assignments, and you'll be punished.] The babies: But we're still just children... Ever since they arrived, the big cat Byakuya has been giving these baby big shots all kinds of assignments. For example: How do you become a top-notch idol? How do you become an athletic boy? How do you become a monster? How do you become a proper villain? And so on... The big shots: There's nothing we can't do, except have a baby! A few things to keep in mind: 1: Everyone is a protagonist in this story. 2: As for the couples, don't pick sides too early~ ~ 3: This is a story about little buns turning into big bad wolves~ 4 [Important]: Everything in this story is made up, and many details differ from the original. 5. It's a parallel world, so there are lots of bugs. 6. Updates will probably be irregular. Theme: