Aira Yuuki 15th Single “A Promise” Cover Art, Tracklist, and Teaser Released! Lead song now available !

Cover art, a tracklist, and a teaser video have been released for Aira Yuuki’s 15th single “A Promise,” which is also the ending theme song of The World’s Finest Assassin Gets Reincarnated in Another World as an Aristocrat!

The lead song, “A Promise,” is a melancholic yet warm chillwave ballad that describes the feelings of someone pining for their lover under the moonlight. It was arranged by Masayuki Hasuo (siraph, ex. School Food Punishment) and opens up new frontiers for him musically. This track will be released ahead of the rest of the album at midnight on October 7.

The second track is another version of “A Promise” sung by Dia (CV. Reina Ueda), the anime’s heroine. The lyrics perfectly describe the character’s feelings, so it’s a must-listen for fans of the anime!

Teaser Trailer

YouTube player

A full length music video of “A Promise” out now!!

You can enjoy this music video by up-and-coming creator Kano Komori with Yuuki Aira in real time!

YouTube player

Anime website:

Yuuki Aira’s official blog “Aira’s Room”:

Yuuki Aira’s official Twitter:

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