Suki ni Sasenai de, Itsuki-kun

The manga centers on Nagisa Hinata, a woman around 30 years old who is despairing after her job isn't going well and she finds out that her boyfriend is cheating on her. She meets a high school boy named Itsuki Seno, who saves Nagisa from someone trying to pick her up while she's feeling down. (Source: Anime News Network)