ENREN KON: ONZOUSHI TO SEIRYAKU KEKKON ITASHIMASU

Ai, the daughter of the long-established Japanese confectionery shop "Kagetsuan," meets a strikingly handsome man, Katsuragi, the heir to a major confectionery company, at a tea ceremony she attends with her grandmother. She never spoke to him and thought they would never interact again—but a few weeks later, on her way to a dinner party celebrating her grandmother's 77th birthday, they unexpectedly meet again. Furthermore, Katsuragi tells her he has proposed marriage to her…!? Confused by this sudden turn of events, but having heard about the situation at "Kagetsuan" from her brother, Ai decides to enter into a politically motivated marriage to ensure the shop's survival—but what will happen? (Source: Starts Shuppan, translated) — Description from AniList community (anilist.co).