'Only One Story' serves as the double title of the EP, pre-released as ZEROBASEONE's first Japanese OST. It was originally released on October 11, 2024 as the fourth opening theme for the anime Pokémon Horizons: The Series. It is a cheering song that gives courage to those who go on an adventure.

• Lyrics: Tomoki Tamatani, KUSHITA

• Music: Tomoki Tamatani, KUSHITA, Sora Tansho

• Arrangement: Sora Tansho

ZEROBASEONE's first fan song in Japan, features a powerful rock sound with the delicate emotions unique to the group. The word "HANA" means "flower" in Japanese and "one" in Korean, and just as one petal becomes "one" to become a large "flower," the song is filled with the story of ZEROBASEONE and ZEROSE, who believe that they are destined to be each other.

Lyrics translation here.

• Lyrics: Ladyhood, Na-yun Jeong, Seo Boeui, Riho Okano, Moon Kim

• Music: Moon Kim, Seo Ji-eun

• Arrangement: Seo Ji-eun

Japanese version of ZEROBASEONE's fourth Korean mini album title track. This is an electronic synth-pop song that features a vast soundscape and synth arpeggio, with a funky melodic baseline. It creates the feeling of diving into space and time.  

• Lyrics: KENZIE

• Music: KENZIE, Andrew Choi, no2zcat, JSONG

• Arrangement: no2zcat