The God of Mathematics who was in the book which Takashi bought. his spell to send Takashi to the different dimension "a signature, cosine, V-sign" M1 can helps them by magic to three times about the one adventure. 

Takashi loves reading books and especially loves "Alice's Adventures in Wonderland". One day, he buys some used books, and he finds one book thrown in. When Takashi opens the book, "the God of Math" M-1 appeared. Takashi is told that Alice is kidnapped, and he's asked to rescue her by M-1. And Takashi goes on an adventure in Wonderland to rescue Alice.
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(Source: Anime News Network)

Passed away on August 29th, 2011 due to stomach cancer.