In a weird kind of circle, the promised collaboration event with Tales of Asteria from the limited time score attack campaign is a limited time score attack campaign itself. From December 17 to December 24 noon, play the follow Tales of-related songs on Taiko Plus or STH, and all scores are converted to hits to an immense slew of monsters.
believe in you (Do as Infinity Pack/limited free during event) テイルズ オブ ゼスティリア メドレー Tales of Zestiria Medley (GTH) 光る闇 Hikaru Yami (GTH) テイルズ オブ エクシリア メドレー Tales of Xilia Medley (GTH/Super Game Pack) テイルズ オブ ジ アビス Tales of the Abyss The arrow was shot (GTH) カルマ Karma (GTH/Popular Song Pack 13)
And hunting down the beasts (total score/hit past goals) nets you additional loot (themes and outfits added to Fukubiki). The end of the line is Giganto Don-chan that holds the secret to four legendary tunes (reach for limited free release for 4 Tales of songs)!
Meanwhile, Don-chan and Kat-chan also appear in Tales of Asteria in various event quests. See here and here for a Tales of Asteria blog's take on that.
Main collaboration site: http://app.taiko-m.com/tales2015/
After the fierce battle, relax yourself with new songs to Gyakkyoku Tori Houdai: 
Tell Your World and メルト Melt, both with Hatsune Miku dancers.
Tell Your World and メルト Melt, both with Hatsune Miku dancers.