
Hirayama Shigeru is given an evil book giving him a power of mind control. After having learned to use it thanks to the girl that is now his slave, he faces another girl, Takamihara Mina, and make a bet with her: If she can find the 3 commands he hid in her, he will release all those he controlled and give up on his power. Will she be able to do it? (Source: VNDB)
Mittsu no Saimin: Bishoujo de Asobu, Himitsu no Yakusoku is a Japanese novel of 84,961 characters, with 4,187 unique words and 1,175 different kanji. Its difficulty rating on Jiten is easy, 1.7 out of 5. The full vocabulary list ranks all 4,187 words by how often they appear, and you can study them on Jiten or download them as an Anki deck.
Here are some of the words that appear most often in this media, as well as a sample of its rarer vocabulary.