乙樹 キララ

Kirara is the tsundere bishoujo from Finland that Shinya meets in the shopping district. She takes great pride in her work as a Santa and finds it insulting that the Seiya family didn’t follow their duties for the past ten years. Because of Mashiro’s inexperience and insistence of becoming a Santa, Kirara “attempts” to train her for the fateful day. If cornered with pressure, Kirara can lose her head and do some pretty crazy stuff. [From m3rryweather's review]