Soko de Shinetara Honmou: Kekkon wa Jinsei no Hakaba!?

Synopsis

"You mean marriage is the grave of life? If I'm not careful, I'll die alone, left out in the open!" Nomura Natsuko continues to get involved with bad men and remains single. It wasn't until her 40th birthday that she discovered her boyfriend was married. "I'm tired of love, but being alone forever is lonely." While she was sulking alone at a bar, she happened upon the feared and harsh-spoken Director Yashiro. Moved by his sudden display of loneliness, despite his lack of romantic interest, Natsuko impulsively proposes a life partnership... but...? It seems like living together as adults without a romantic relationship might actually work out surprisingly well!? (Source: Cmoa Comics, translated)