"ASTRO FES," a large-scale music event, is going to be held! Chiaki, Jun, Izumi, and Natsume meet with some students from Shibuya who work "in fields different than of being an idol," and will be performing at the festival in a collaboration—
Harmonizing SEKAI (奏で合うセカイ, kanadeau sekai; lit. harmonizing world) is an event story released on Feb 15th 2025. It is unlocked for free during Colorful★Shining Stars of the World 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 Fusion is associated with this story.
It features Tsukasa, Ritsu, Arashi, Eichi, Izumi, Chiaki, Leo, Natsume, Jun, Toya, Tsukasa Tenma, Rui, and Akito.
CGs
_Izumi_Sena_CG.png "(Advancing Star Following its Dreams) Izumi Sena CG.png (1.23 MB)")
_Natsume_Sakasaki_CG.png "(Guiding Star Stirring the Heart) Natsume Sakasaki CG.png (991 KB)")
_Chiaki_Morisawa_CG.png "(Shooting Star Soaring to the Sun) Chiaki Morisawa CG.png (1.48 MB)")
世界の平和を守るヒーロー、『流星レッド』が、全力で応えよう
_Jun_Sazanami_CG.png "(Rising Star Striving for Greater Heights) Jun Sazanami CG.png (1.62 MB)")
『また会えるのを楽しみにしてますよぉ～♪』
_Natsume_Sakasaki_CG2.png "(Guiding Star Stirring the Heart) Natsume Sakasaki CG2.png (1.56 MB)")
_Izumi_Sena_CG2.png "(Advancing Star Following its Dreams) Izumi Sena CG2.png (1.56 MB)")
_Jun_Sazanami_CG2.png "(Rising Star Striving for Greater Heights) Jun Sazanami CG2.png (1.71 MB)")
（漣ジュンの本気、見せてやりますよぉ～！）
_Chiaki_Morisawa_CG2.png "(Shooting Star Soaring to the Sun) Chiaki Morisawa CG2.png (1.8 MB)")
『どうか最後の一瞬まで、目を離さずに見ていてください！』
Episodes
| Prologue | |||
|---|---|---|---|
| 1 | Episode 1 | ★ |     
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| Intertwining SEKAI | |||
| 2 | Episode 1 | ★ | 
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| 3 | Episode 2 | ★ |     
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| 4 | Episode 3 | ★ |
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| 5 | Episode 4 | ★ | 
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| 6 | Episode 5 | ★ | 
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| 7 | Episode 6 | ★ |
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| 8 | Episode 7 | ★ |
|
| Harmonizing SEKAI | |||
| 9 | Episode 1 | ★ |
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| 10 | Episode 2 | ★ |
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| 11 | Episode 3 | ★ |
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| 12 | Episode 4 | ★ |
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| 13 | Episode 5 | ★ |
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| Epilogue | |||
| 14 | Episode 1 | ★ |
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Mini Talks
Trivia
- This is an collaboration story with Project SEKAI COLORFUL STAGE!.
- This story was released in two parts.
- Prologue to Intersecting SEKAI - 7 were released on Feb 15th 2025.
- Harmonizing SEKAI - 1 to Epilogue were released on Feb 19th 2025.
- For the collaboration stories that were released on Project SEKAI COLORFUL STAGE!, please see Project SEKAI Collaboration Stories.