Kekkon Shiyou. Rikon Zentei de.

"Kyosuke, let's get married. But with divorce as the goal."
Kyosuke was kicked out of his parents' house because he was still a NEET even after turning 30, and the next thing that hit him was a fake-marriage proposal from his only friend, Rusei! What will a man and a woman who have been "just friends" for more than a decade find in their 100 days of married life?
A romantic man and a pragmatic woman.
A pure love comedy about a fake marriage between two people who are definitely not suited for marriage!
(Source: Gangan Online, translated)