Saya's neighbor and the owner of Guimauve, a coffee shop near Saya's home. He is also a friend and junior of Tadayoshi back in their high school years, although he attended it much later than Tadayoshi. Fumito usually serves breakfast for Saya and makes bento lunches for her. He once stated to Saya that she is special to him, and that she is more important to him than anything else. After her battles, he expresses his concern towards Saya by bringing coffee and guimauve to her after her battles. Saya once questioned him about his guimauve asking if they were always pink in color—he is mysteriously states it depends what is mixed in them.
In the penultimate episode, it is revealed that he was the one behind the experiment to see whether Saya would revert back to her previous personality thus making him the series's main antagonist.