MTL - Gold Lord is Very Busy - Chapter 81

Haewon, a violinist, is a nonchalant person who neither blocks the ones who come into his life nor holds onto those who leave. One day, his only friend, Taeshin, commits su*cide, and after failing to speak to Taeshin, who called him several times shortly before his death, Haewon is haunted by his death, even though he doesn’t have much of an attachment to human relationships. Then, he inevitably runs into Woojin, the man Taeshin had a crush on, and Haewon indifferently crumples up the business card Woojin hands him.One day, Haewon, forced into an unwanted relationship, becomes entangled in an assault case, but thanks to the business card given to him, he receives help from Woojin, who’s a prosecutor. Haewon feels uncomfortably guilty and tries to keep him at arm’s length, but Woojin is comfortable enough to take a few extra steps.

"The boy has no powers," they claimed.

A mortal teenager strayed into the immortal way because of an accident, struggling on the road of seeking immortality.

Immortal Road is difficult to climb to the sky, in the face of numerous obstacles, his desire to seek the truth is still unabated.

Looking back again, the green mountains are still there, so the old is boneless.

- Description from novelbuddy

A series of short stories in the world of Toaru Majutsu no Index organized into chapters featuring Kanzaki Kaori as the protagonist, going around the world and space doing missions for the Church of Necessary Evil, however, there is more than meets the eye as each incident is connected.

One chapter was bundled with each limited edition release of the Toaru Kagaku no Railgun anime DVD and BDs, with all of them together being equivalent to a single normal Toaru Majutsu no Index volume