[Slightly hardcore] + [A huge number of self-created academies and students] + [With both angst and sweet moments] + [Daily life/battle]...

Thirty years ago, the Seventeenth Joint Campus was destroyed by an unknown force, turning the once prosperous academy into a desolate ruin. Our forefathers fought desperately during the catastrophe, sacrificing their lives to give their descendants a chance to survive. However, the survivors still wander among the ruins, lost, helpless, and uncertain of the future.

Just as despair was spreading, a firm voice rang out:

"Reconstruction, revival, revenge."

Guided by this brief yet powerful message, the students of Campus 17 wiped away their tears and rose again. They rebuilt their homes from the ruins, unearthing buried scientific discoveries from the depths of the rubble, etching the tragedy into their hearts and transforming past pain into motivation for progress. Beneath the wasteland lies not only a shattered civilization, but also revelations powerful enough to change the future.

Thirty years later, when a similar disaster struck another school known as "Children's Eden," the students of the Seventeenth Campus resolutely raised the blade of revenge. They were no longer helpless survivors, but fighters who had overcome the shadow of death. With thirty years of accumulated experience and the strength forged from the ruins, they would safeguard hope and reverse their fate.

"The past belongs to history, but we remember it."

"What is now ruins, we will rebuild."

"The future belongs to hope, and we create it."

[Slice of Life, Harem, Heartwarming, Funny] Louis, a little boy who fell from the sky. Ship girls, a group of lonely, infighting girls, but when the ship girls met Louis, the port already had a commander. As the only commander in the port, Louis's daily life is busy and bittersweet. The ship girls steal his clothes, rob him of his food, and even beat him up in alleyways. Every time, Louis gets sucked dry by the ship girls; anyone who doesn't know better would think they're vampires. "White Dragon, give me back my bitter tea!" "Frederick the Great, don't come any closer!" Today, Louis is still being driven crazy by the ship girls...

This is a sequel to the previous book, telling the story of a group of high school seniors and their teachers who travel into the world of Detective Conan and become characters from Honkai Impact 3rd.

Multiple main characters, no romantic pairings (except for the official pairings), chat group, movie viewing, gray faction (leaning towards cooperation with the red faction), and independent organizations.

The author is a novice, a recent high school graduate. As a science student, the writing is not very good. The characters in the book are not based on the author himself, so there will be out-of-character (OOC) aspects in their personalities, reflecting the author's personal interpretation.