Avid bookworm and college student Motosu Urano ends up dying in an unforeseen accident. This came right after the news that she would finally be able to work as a librarian as she had always dreamed of. When she regained consciousness, she was reborn as Main, the daughter of a poor soldier. She was in the town of Ehrenfest, which had a harsh class system. But as long as she had books, she didn't really need anything else. However, books were scarce and belonged only to the nobles. But that doesn't stop her, so she makes a decision... "If there aren't any books, I'll just create some."
Iko, a third grader, lives with his four older brothers in an old house in Tateyama. Iko's family has no parents, and according to his older brothers, their mother works in Tokyo. Despite being a bit eccentric, Iko loves his brothers, who take good care of him, but they have a secret: they are wizards who live almost forever... The story unfolds of a family's summer vacation in a seaside town, happily living together while being caught up in the world of wizards.
As master assassin Usui Yuen looks into a series of assassinations made on the grand samurai clan, the Satsuma, he encounters Kurima Raizo, member and survivor of one of the attacks. Together, they discover the true nature of these murders is bigger than over stolen resources. As they get closer to the truth, will they come out alive to exact revenge?
