One of Takumi's best male friends, and a gal maniac. He frequently provokes Fumino with his comments and is most of the time protected by Takumi from her outbursts. He also has a tendency to compare situations in gal to those in real life. He calls Otome 'Master', due to the fact that she once saved him from a group of delinquents, and has been the only girl in the 3-D world whose existence he fully acknowledges. He is normally seen with or talking with Chise on her plans due to both of their liking of anime and manga and the fact that Chise often offers him something of value due to her wealth.
- It is likely that he is named after Tokugawa Ieyasu (1543 - 1616), the daimyo of Mikawa who lived during the Sengoku period, as well as the founder and first shogun of the Tokugawa shogunate, which ruled from 1603 to 1854