It is the late 1980s. Rumors of a witch living inside an old mansion circulate in the city. Unbeknownst to observers, living inside the mansion is an actual witch, Alice Kuonji, a stoic woman and a magus hiding in the present day. Under her tutelage studies Aoko Aozaki, a high school student studying magecraft as the head of the Aozaki family. As magi, the two of them secretly fight any threat that enters their town.

It was said --
There was a mansion that rested on top of a hill, and within it there lived two witches.

Things start to change when a young man unfamiliar with city life, Shizuki Soujuurou, enters their lives. Slowly, he affects the lives of these two magi. And so their story begins...

Mahou Tsukai no Yoru - Witch on the Holy Night is a Visual Novel set in the Nasuverse. Originally a five hundred-page novel penned by Kinoko Nasu, it was never publicly released and only a handful of copies were distributed. It was announced for a visual novel remake on 2008, but it got stuck in Development Hell several times before finally being released on April 12, 2012. A translation of the demo text can be read here.

Unlike the other Type-Moon visual novels, Mahoyo is a linear novel with no branching plot lines. It is also Type-Moon's first all-ages visual novel.

Tropes used in Mahou Tsukai no Yoru include: