What is tensei kizoku no isekai boukenroku?

"Tensei Kizoku no Isekai Boukenroku" is a Japanese light novel series written by Nini and illustrated by Kyouym. The story follows a young man named Zagan Anes, who was reincarnated into a fantasy world as the son of a powerful noble family. Now known as Kurono Crawford, he decides to live a peaceful and carefree life in his new life.

However, his plans are disrupted when a mysterious girl named Leila appears before him, claiming to be his fiancee. Together with Leila, Kurono embarks on a new adventure in this fantasy world filled with magic, monsters, and political intrigue.

The light novel series is published by Hobby Japan under their HJ Novels imprint. It has also been adapted into a manga series and has gained popularity for its engaging story, well-developed characters, and unique take on the isekai genre.