mahou tsukai no hako

Mahou Tsukai no Hako (まほうつかいの箱, Magician's Box?) is a series starring TYPE-MOON mascots Hibiki Hibino and Chikagi Katsuragi. It is also the name of TYPE-MOON's mobile website that ran from 2009-2014.
https://typemoon.fandom.com/wiki/Mahou_Tsukai_no_Hako