Isogaba Sefure.

Sasada, a work colleague that Hibana had a crush on, is getting married!! Shocked by the news, Hibana tries to forget about it at her high school reunion. That's when she is reunited with Kyota, who had come late. Kyota was Hibana's "best guy friend" back in school. As both of them weren't doing so well in their love lives, they decide to comfort each other as "friends with benefits." This is a heart-pounding love story about two people overcomplicating their romance!

(Source: Love Jossie, translated)

Note: Includes five additional 0.5 chapters