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Mao-chan is a cheeky high school girl who loves to tease her virgin big (step)brother in naughty ways. However, her true intention is actually...? (Source: [BookLive](https://booklive.jp/product/index/title_id/20063387/vol_no/001)) --- Note: the original Pixiv series has been collected and published into 2 volumes. Volume 1 (上) \"Up\" contains chapters 1-20. Volume 2 (下) \"Down\" contains chapters 21-42.
After getting revenge on the Thulcaan Empire, Jack Valantier took his last breath. But just when he thinks it\'s all over, he finds himself transported back to when he was 14! From his negligent and wicked family to his loyal servant and caring sister, it\'s all just as he had remembered. But this time, Jack is armed to the teeth with decades of experience from his previous life! He\'s ready to give them hell, and those that have wronged him will pay dearly. Because this time, he\'s invincible.
While trailing someone, the poor detective Sousuke Kaburagi runs into Sara, an imperial princess from another world who uses black magic. Sousuke and Sara gradually begin living together, but in the blink of an eye, Sara becomes accustomed to modern-day Japan... Meanwhile, Livia—a female knight who transferred to the world after Sara, is enjoying a surprisingly pleasant life, even though she is homeless. The two otherworldly individuals who live a pleasant and strong life influence Sousuke and the other oddballs who live here, such as a devilish lawyer, a divorce agent, and a cult leader. --- **Links:** - [Official LN (JP)](https://www.shogakukan.co.jp/books/09453038)
A cute girl came knocking at the protagonist\'s door, but for what reason may it be.
I have a neighbor next door who is a NEET, but she\'s not just any NEET.
This is a world where science and magic coexist. Here, some people pursue powerful magic, while others learn eternal truths. The protagonist, Blair, a mathematician who came from a different world, with left-handed magic and right-handed science, opens the door to a new world! Academic Dean? Supreme Witch? Senior Killer Brother? As an adult, I want it all!
