Amayo no Tsuki ni

"Amayo no Tsuki ni" was written by Shizuka Kudo,[3] under the pseudonym Aeri, and Hiroo Yamaguchi, who also arranged the track.[4] It is Kudo's first single on which she is credited as a lyricist in two years, since "Lotus (Umareshi Hana)", which she also co-wrote with Yamaguchi. "Amayo no Tsuki ni" is described as a midtempo song with a dramatic string-based accompaniment.[5] Lyrically, the song describes a protagonist's proclamation of unwavering love to her companion, whom she vows to stand by through rain and thunder and be the "moon on a rainy night". The song is composed in the key of C-sharp minor and set to a tempo of 91 beats per minute,[6] while Kudo's vocals span from G♯₃ to C₅.

Barks praised Kudo for the natural tone of her singing voice and for delivering an emotive vocal performance.[5] The track received acclaim from CDJournal critics for its "simple and tight" sound and elegant string ensemble.[4] Kudo received praise from CDJournal for "singing with an impressive amount of pheromones, without fail".[4]

"Amayo no Tsuki ni" debuted at number 44 on the Oricon Singles Chart, selling 4,000 copies in its first week, and charted for six weeks.[7][8] The song performed well digitally, ranking at number 19 on the mid-year Mora Chaku-Uta Full Singles Chart.[9]