DECAYING RØSES, often abbreviated as DecaRose or DecaRo (デカロ), is a wiki unit and an online music group who debuted at September 15, 2025. They are the 5th unit that is part of Project SEKAI: FANON STAGE! Feat. Hatsune Miku, representing 25-ji, Nightcord de.
Background[]
As a middle schooler, Angel missed most of the stuff happening during that time because she felt like she didn't belong anywhere. Depsite wishing they could be that "type of person", she always skipped most of their classes and kept isolating themselves. Some few years later, Angel ended up finding a site, the Project SEKAI Wiki. Since their only resort at the time was the online world, she decided to stay there and create a wiki unit. She made a poll titled "Does anyone want to join my wiki unit?", and the three first people to vote "yes" on the poll were Raamen, Mystic and Oliver.
They started interacting more after the band formed in the popular chatting app named "Nightcord". One day, Angel stumbles upon seeing a screen of Hatsune Miku. Upon returning to her home, they discover a song on their smartphone named "Untitled". Out of curiosity, Angel plays the song, only to be surrounded with a white light. Upon waking up, she realizes she got transported into the Decaying Museum SEKAI.
SEKAI[]
The Decaying Museum SEKAI is similar to the Empty SEKAI, with some few differences. Unlike the Empty SEKAI, this SEKAI is located in a closed and old museum, the only visitors being DecaRo (and their VIRTUAL SINGERS). The Decaying Museum SEKAI also is a empty place filled with darkness.
The Decaying Museum SEKAI was made from Angel's feelings.
Members[]
Members[]
 Angel "HALO" |
 Raamen "RAMEN CUP" |
 Mystic "ARCTURUS" |
 Oliver "NIGHTLIGHT" |
 Spice "SUGARNSP1CE" |
VIRTUAL SINGERS[]
| vflower Joins in Main Story |
Fukase Joins in Main Story |
MAYU Joins in Main Story |
| SEKAI Joins in (SEKAI's intro story) |
KAFU Joins in (KAFU's intro story) |
 Hatsune Miku Joins in (Miku's intro story) |
 Kagamine Rin Joins in (Rin's intro story) |
 Kagamine Len Joins in Thrilling Day! Theme Park Adventures☆ |
 Megurine Luka Joins in Happy!☆ Summer Day! ~Lively Summer Adventure~ |
Story[]
Please, refer to this blog post for DecaRo's main story and event stories! Thank you for understanding.
Songs[]
| Song | Producer(s) | Date Added (JP) | Date Added (EN) |
|---|---|---|---|
| MASQUERADE | WonderSun-P (Oliver) | 09/17/2025 | 09/17/2026 |
| NATURAL | WonderSun-P (Oliver) | 10/04/2025 | 10/04/2026 |
| Okay. | WonderSun-P (Oliver) | 12/19/2025 | 12/19/2026 |
| Admiring the Blooming Flowers | TBD | 12/22/2025 | 12/22/2026 |
| Song | Producer(s) | Date Added (JP) | Date Added (EN) |
|---|---|---|---|
| Mahou Shoujo to Chocolate | PinocchioP | 10/11/2025 | 10/11/2026 |
| ×Handi♡Capper× | PEPOYO | 10/14/2025 | 10/14/2026 |
| YAMADA PERFECT | jon-YAKITORY | 10/19/2025 | 10/19/2026 |
| Meta | PinocchioP | 10/19/2025 | 10/19/2026 |
| Abnormality Dancin' Girl | Guchiri | 11/01/2025 | 11/01/2026 |
| AaAaAaAAaAaAAa | Nashimoto Ui | 11/09/2025 | 11/09/2026 |
| Please Play-Bite | PinocchioP | 11/15/2025 | 11/15/2026 |
| SIU | MARETU | 11/15/2025 | 11/15/2026 |
| Nice to Meet You, Mr. Earthling | PinocchioP | 11/15/2025 | 11/15/2026 |
| New Darling | MARETU | 11/29/2025 | 11/29/2026 |
| Ima Sugu Rinne | Nakiso | 01/02/2026 | 01/02/2027 |
| Self-Destructive Girl | EMIRI | 01/??/2026 | 01/??/2027 |
Trivia[]
- Spice is the newest DecaRo member, joining on September 28, 2025.
- The rest of the DecaRo members (Angel, Raamen, Mystic and Oliver) all joined the unit the day it was created, at September 15, 2025.
- DecaRose is the only FNST unit to not feature all of the 6 cryptonloids as their VIRTUAL SINGERs. The only Crynptonloids in this unit are Miku, Rin, Len and Luka.
- DECAYING RØSES is also the only FNST unit to feature more than 6 vocal synths as their VIRTUAL SINGERs.
- Their original wiki unit name was "W!KIANS AT 25:00", but that was scrapped later.
- In FANON STAGE!, DECAYING RØSES are the successor to DISMAL DREAMERS, who formerly represented 25-ji, Nightcord de.
- Sakura☆Stars originally represented 25-ji, Nightcord de.
- They represent Vivid BAD SQUAD in FNST now.
- DecaRo's starting VIRTUAL SINGERs are vflower, Fukase and MAYU.
- With that being stated, DECAYING RØSES and WanderWALL are the only FNST units to not have Miku as their starting VS.
- Raamen was the one that came up with the unit's name abbreviation, DecaRo.
- Spice was the one who designed the unit's logo.