tales-of-asteria:

Duration: 12/31 (Thu) 22:00 – 1/8 (Fri) 15:59

Chance to get 5☆ Yuri (Kimono), 5☆ Colette (Kimono), 5☆ Rose (Kimono), 5☆ Elize (Kimono), 5☆ Sophie (Kimono), and 4☆ Mint (Kimono) from the
special gacha.

※ The first spin for the event period will also only cost 3 Asteria Stones instead of 5.

※ The background pictured above is unlockable once you acquire one of the said characters.