Spiral: Bond of Reasoning is a tV series anime that premiered in fall 2002, produced by J.C.STAFF.

About the production: the story comes from a manga, there are 25 episodes of about 23 minutes and its current status is "finished".

Its main genres are comedy, drama and mystery, with themes such as Detective, Male Protagonist, Conspiracy and Shounen.

On AniList, Spiral: Bond of Reasoning has an average score of 67%, a good score, and appears on 8,214 users' lists.

Ayumu Narumi's older brother Kiyotaka, a renowned detective and piano player, disappears all of a sudden. The only clue Narumi has, are the Blade Children. Two years later a row of murders and incidents begin, relating to the Blade Children. Together with school journalist, Hiyono Yuizaki, Narumi tries to figure out their destiny. (Source: Anime News Network)

Official synopsis from AniList.