This is a story about a twisted relationship between a high school girl and a twenty something Otaku man that is forced to live with her and basically obey all her eccentric whims in exchange for her being a live model for a doll he is making.
It is just as creepy as it sounds, but it also has plenty of heart and will make you care for both main leads.
I have only been able to find up to chapter 26 of this series, so the translation is incomplete, but if you liked Sundome and want something similar, then I would recommend Ibitsu to you.
~WiruSempai