The Whole Class Transmigrated, Then Came Back Again

[Complete] Class 9, Grade 11, transmigrated as a group one year before the college entrance exam. A Western fantasy world, turbulent and rife with war. A group of students with the broadest knowledge they will ever have in their lives are handed the scripts of overpowered heroes, and set the Western fantasy continent ablaze. Class monitor: Diary of an Elf Saint's Growth Deputy class monitor: Thirty years east of the river, thirty years west of the river. Never bully a poor young man. Arts committee member: Bewitching Beauty, Your Majesty, Be Careful Biology class representative: The Empress's Journey, Starting from Zero A hundred years later, just as everyone in Class 9, Grade 11, is about to reach the pinnacle of power in the Western fantasy world and enter the history books, they all transmigrate back together. The students of Class 9, Grade 11: So this is how you want to play it! The continent's greatest dragon knight, the empire's queen, the most powerful astrologer... They have no choice but to face the reality that all their powers are gone and their college entrance exam is fast approaching. After the whole class transmigrates, then transmigrates back to their original world as a group, their bonds as classmates run deep. There are no schemes or rivalries, only helping one another. An ensemble cast, with the homeroom teacher as the protagonist. No special abilities in the early chapters. The two worlds begin to merge later on. [Ongoing | No CP] One Street in Beika, and They're All My Classmates Transmigration isn't scary. What's scary is transmigrating into Detective Conan. What's even scarier is becoming a Man in Black. Bai Yan is freaking out. The good news is, he isn't the only transmigrator: his whole class transmigrated too. The class monitor works at the Poirot Cafe, the deputy class monitor became a teacher at Teitan Elementary School, and the class representative for academics is in the same class as Ran Mouri. The biology class representative is swamped at the hospital every day, while the sports committee member has made a home at the Beika Police Station... Then the physics class representative said: You lot have it easy. I transmigrated straight into the Black Organization as a bona fide member. The class representative for academics quietly raised a hand: What a coincidence. I'm an undercover agent who infiltrated the Black Organization. A fun group-transmigration story. Friendship comes first. Theme: Friends should help one another and live together in harmony and affection.