"境界の彼方" (Kyōkai no Kanata) is a Japanese light novel series written by Tomohiro Matsu and illustrated by Kei Origa. The series was later adapted into an anime.

Key points about "境界の彼方" (Kyōkai no Kanata):

1. Genre: Fantasy, romance, supernatural

2. Setting: The story takes place in a world where "Youkai" (supernatural beings) and humans coexist.

3. Main characters:

- Akihito Kanbara (a half-youkai boy)

- Mirai Kuriyama (a girl with the ability to control blood)

4. Plot: The story follows Akihito as he tries to prevent his own death, as he is an "immortal being." He teams up with Mirai and other characters to fight against dangerous youkai.

5. Themes: Coming-of-age, acceptance, understanding differences

6. Adaptation: An anime television series adaptation was produced by Kyoto Animation and aired from October 2013 to December 2013.

7. Media: The series consists of multiple novels, manga adaptations, and the anime series.

The story explores themes of coexistence between humans and supernatural beings, as well as personal growth and acceptance of one's unique qualities.