What is guren no kizuna-hen?

As an AI language model, I cannot tell which specific show or movie you might be referring to. However, 'Guren no Kizuna' is a Japanese animated television series that was aired in 2008. It is known in English as 'The Crimson Thread of Kinship' and is a prequel to the popular video game franchise, "Souls".

The plot of "Guren no Kizuna-hen" revolves around a group of young people who are part of a secret organization known as the Fenrir. The organization trains the youth to become warriors who are skilled in fighting and using special powers called 'Artes'.

The story explores the personal and emotional journeys of the characters as they face conflicts and challenges within and outside the organization while trying to protect their loved ones and the world.

The series has received mainstream success and critical acclaim for its compelling storyline and character development, as well as its striking animation and action sequences.