Onnashujin no Lunchtime

Hatsuko was an ordinary woman who managed to marry Kukasabe Seiichi, the young president of Kukasabe Group, one of Japan's leading conglomerates. Returning from their honeymoon, they settled in at a luxurious mansion with Chinatsu, Seiichi's grandmother. She had lived in Europe for a long time, but she had just lost her husband, which made her act eccentrically, and she complained about everything Hatsuko did. Will Hatsuko ever be accepted by her grandmother-in-law Chinatsu? (Source: Kodansha, translated)