Hiru to Yoru no Oishii Jikan - MangaDex

"Today's dinner is omurice!" "Don't need it." A story of the cohabitation between a skilled high school chef and a middle-aged novelist. After his father's move abroad, Asaoka Mahiru began living with one of his father's acquaintance, the indifferent novelist Kitagawa Yoruko. Despite being close to a guy, she walks around without a bra and refuses to eat Mahiru's meals. His attempts at getting her to eat result in…?!