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Lit. "Eastern Magic Treasure Castle", also known as Touhou Mahoujou.
An original Touhou fangame coded by raichu and the story written by Milka Oyasu (who also wrote The Last Comer, Mystical Power Plant and Riverbed Soul Saver). The game's trial stages were released in installments, with the full game being released in November 2016.
Playable Characters
Stage 1: Fabritis and Iphonea (one is the mid-boss depending on what shot type you pick)
Stage 2: Takatou Tobiko
Stage 3: Shelia Lyrac
Stage 4 Mid-Boss: Fujiwara no Mokou
Stage 4 Boss: Mochizuki Ichiyou
Stage 5 Mid-Boss, Boss, and Stage 6 Mid-Boss: Akitsu Nezu (she disguises herself as one of the playable characters for the Stage 5 mid-boss section, albeit with her wolf ears and tail still visible)
Stage 6 Boss: Fuma Mishandra
Extra: Sanada Sengo