The President of COS PRO is stepping down, and so Ibara temporarily entrusts the position to the Producer. However, a project called "Everyone's Friendly★COS PRO Fan Meeting" is created, which was not part of Ibara's plan...
Ouroboros (ウロボロス, uroborosu) is an event story released on Mar 31st 2025. It is unlocked for free during Slither◆Ouroboros and its Dwelling Deep Underground event and during the unit's future events. Producers can unlock story chapters manually after one month from the story's release at the cost of 3
JP or 30GLB for each chapter. The song Enkan no Refraction is associated with this story.
It features Hinata, Yuta, Yuzuru, Mika, Shu, Hiyori, Jun, Nagisa, Ibara, Rinne, HiMERU, Kohaku, and Niki.
CGs
_Ibara_Saegusa_CG.png "(Infinite Desire) Ibara Saegusa CG.png (1.39 MB)")
Ever-changing Cycle - 3
いえいえ、あんずさんの企画となればどれも有益なものに違いありません！ 然るべきときにしかるべき場所で聞くのが良いでしょう
いえいえ、あんずさんの企画となればどれも有益なものに違いありません！ 然るべきときにしかるべき場所で聞くのが良いでしょう
_Nagisa_Ran_CG.png "(Perfect Future) Nagisa Ran CG.png (1.03 MB)")
Feelings that Cycle Back - 6
_Nagisa_Ran_CG2.png "(Perfect Future) Nagisa Ran CG2.png (1.56 MB)")
Feelings that Cycle Back - 8
_Ibara_Saegusa_CG2.png "(Infinite Desire) Ibara Saegusa CG2.png (1.64 MB)")
Feelings that Cycle Back - 8
Episodes
| Prologue | |||
|---|---|---|---|
| 1 | Episode 1 | Summer |    
|
| Ever-changing Cycle | |||
| 2 | Episode 1 | Summer |
|
| 3 | Episode 2 | Summer |
|
| 4 | Episode 3 | Summer |     
|
| 5 | Episode 4 | Summer |
|
| 6 | Episode 5 | Summer |
|
| 7 | Episode 6 | Summer |   
|
| 8 | Episode 7 | Summer |
|
| Feelings that Cycle Back | |||
| 9 | Episode 1 | Summer |
|
| 10 | Episode 2 | Summer |
|
| 11 | Episode 3 | Summer |
|
| 12 | Episode 4 | Summer |
|
| 13 | Episode 5 | Summer | 
|
| 14 | Episode 6 | Summer |
|
| 15 | Episode 7 | Summer |
|
| 16 | Episode 8 | Summer |
|
| Epilogue | |||
| 17 | Episode 1 | Summer |
|
Mini Talks
Trivia
- This story was released in 2 parts.
- Prologue to Ever-changing Cycle - 7 were released on Mar 31st 2025.
- Feelings that Cycle Back - 1 to Epilogue were released on Apr 4th 2025.