Arknights releases a new side story, Somniloquium Serenum, as part of a collaboration with BanG Dream!. Find out more about Ave Mujica's arrival in Arknights below.
Arknights Crossover Side Story with BanG Dream!
Two Gacha Worlds Collide
Arknights is collaborating with multimedia music franchise BanG Dream! for its 39th side story, Somniloquium Serenum, which goes live globally on February 10 at 7:00 AM PT / 10:00 AM ET to March 3 at 2:59 AM PT / 5:59 AM ET. The crossover project comes less than a month after Arknights' sixth anniversary on January 16, and is the first video game appearance for the metal band Ave Mujica, since they have not yet been formally added to BanG Dream! Girls Band Party! yet.
Kindly refer to the table below for the crossover’s duration in different time zones:
| Timezone | Collab Duration |
|---|---|
| Pacific Time (PT) | February 10 (7:00 AM) to March 3 (2:59 AM) |
| UTC-7 | February 10 (8:00 AM) to March 3 (3:59 AM) |
| Eastern Time (ET) | February 10 (10:00 AM) to March 3 (5:59 AM) |
| Japan Time (JST) | February 11 (12:00 AM) to March 3 (7:59 PM) |
New Operators—the playable, collectible characters in Arknights serving as the game's tower defense system—feature Ave Mujica's band members Sakiko Togawa (keyboardist), Umiri Yahata (bassist), Mutsumi Wakaba (guitarist), Uika Misumi (guitarist-vocalist), and Nyamu Yūtenji (drummer). Each character has her own stage costume with cosmetic rewards.
The Operators are available from the collaboration's launch date until February 24 at 2:59 AM PT / 5:59 AM ET, also during the limited headhunting banner, Cantilena Puppae. Limited headhunting banners are time-limited gacha events that introduce Operators exclusively obtainable from specific events.
The side story, Somniloquium Serenum, is divided into two event stages:
⚫︎ First phase | Somniamus Omnes - Starts February 10 at 7:00 AM PT / 10:00 AM ET; ends February 24 at 2:59 AM PT / 5:59 AM ET.
⚫︎ Second phase | Amor Fati - Starts February 17 at 3:00 PM PT / 6:00 PM ET; ends February 24 at 2:59 AM PT / 5:59 AM ET.
In these events, players must clear stages and complete missions to earn rewards ranging from Operators Nyamu and Umiri to furniture pieces.
Moreover, the new mechanism is anchored in a moonlight theme that brings enemies to life at night. In a Twitter post, Arknights introduced the enemies as the Clockwork Servant, Background Clown, and Sleep Companion Beast.
Ave Mujica Debuting in Other Games First
Although the anime BanG Dream! Ave Mujica has already aired in 2025, the Japanese all-female metal band has yet to appear in the BanG Dream! Girls Band Party! mobile rhythm game itself. After Arknights, they will have another collaboration with Dozle Corp., a game commentary group famous in Japan for their Minecraft-themed content. Because of this, fans have been joking about how Ave Mujica is "in every game but their own."
Ave Mujica is a Japanese all-female band in the BanG Dream! media franchise by Bushiroad. They also perform in live concerts, and their music has been described as influenced by gothic rock and metalcore. In 2024, Rolling Stone Japan featured them in the "Future of Music" issue as one of the 25 artists representing Japan.
BanG Dream! Girls Band Party! is a free-to-play rhythm game developed by Craft Egg and published by Bushiroad for Android and iOS. It has a paid Japanese-exclusive Nintendo Switch port.
Arknights is also a free-to-play game with gacha mechanics, developed by Hypergryph and Studio Montagne and published by Yostar. The tower defense RPG is currently available on Android and iOS platforms. Its spin-off sequel, Arknights: Endfield, was recently released on January 22.
To stay updated on all things Arknights, check out our article below.
Sources:
ARKNIGHTS X BanG Dream! Ave Mujica Collaboration Teaser Trailer
ARKNIGHTS X BanG Dream! Ave Mujica Collaboration New Side Story Event: Somniloquium Serenum
Somniloquium Serenum New Mechanics and Enemies
Ave Mujica – Completeness
「Future of Music」日本代表25組を発表 世界各国のRolling Stone誌がアーティストを選出
Ave Mujica in Minecraft
A Minecraft Escape Game in collaboration of Dozle Corp. x TV Anime BanG Dream! Ave Mujica
has been announced
