Hiru to Yoru no Oishii Jikan

After his father moves abroad, Mahiru Asaoka began living with one of his father's acquaintances: the indifferent novelist, Yoruko Kitagawa. She walks around without a bra despite being around a young man, and refuses to eat Mahiru's meals. His attempts at getting her to eat result in...!?

(Source: Frontier Works, translated)