This is a new Unity3D game by Ateam just released for iOS and Android. Music is by Motoi Sakuraba.

All music data appears to be loaded on demand as .unity3d files with an UnityFS header. They appear to be readable using the AssetBundle Manager available at https://www.assetstore.unity3d.com/en/#!/content/45836 but as I don't do Unity nor .NET/Mono I hope somebody else can handle them for us. Thanks in advance!

Here are all sound files I saw being requested from the server so far:
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_as_20013.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_as_20023.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_op_loop.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_burst_10003.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_knife.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_levelup_c.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_gacha_loop.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_gacha_production_loop.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_battle_burst.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_battle_burst_max.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_gacha_jingle2.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_gacha_jingle2.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_gacha_jingle1.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_map_loop.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_battle_loop2.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_battle_start.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_battle_damage.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_battle_damage_critical.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_heal.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_battle_burst_push.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_battle_dead.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_battle_get.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_quest_clear.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_battle_win.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_battle_result_get.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_battle_loop3.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_burst_10002.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_as_20038.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_home_loop.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_absorption.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_itemget.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_guild_loop.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_shop_loop.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_as_20011.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_as_20010.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_burst_10009.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_as_20008.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_burst_10010.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_burst_10008.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_arena_loop.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_battle_loop4.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_battle_lose.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_battle_loop1.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_as_20026.unity3d
http://res.ja.valkyrieconnect.com/res/iOS/abca74f01193a15b9b0fb1c68437ff2e/AssetBundles/additional_sounds_s_levelup_p.unity3d

The files containing "loop" in the name are likely the (looping) music files, the remaining files jingles and sfx.

If you like me to link other Unity data from the game let me know, it appears to download pretty much everything on demand.

Thanks to Infernus Animositas I was able to create a set myself, get it at Thread 207422