Wth Easter upon us, this was just a too good of a pun not to use it (and we had to explain why we hadn't Released anything in a month). This is what our Team's working on at the moment. Stay tuned for the Releases!
Futaba is a hikikomori who at first never comes out of her room. In the game, the "Futaba notebook" is a list of things Futaba wants to do (like going out by herself) after meeting the protagonist.
She is not a playable character. She is an AI-controlled support character.