Bittersweet

Eda Maki works for an advertising agency at a large company. She is single and doesn't have good luck with men. She also isn't very good at cooking and likes eating junk food. One day, she meets Katayama Nagisa. He is an art teacher and a vegetarian. Unlike Maki, Nagisa cooks very well. The two people then happen to live together. Maki realizes that she is in love with Nagisa, but Nagisa is gay. Through his cooking, they solve their own problems and become important to each other.
(Source: The Grand Cinema)
~~ Adapted from the manga series "Nigakute Amai" (にがくてあまい) by Kobayashi Yumio (小林ユミヲ).