Mei-chan no Shitsuji Episode 5

Rihito and Mei are upset by Lucia's words that suddenly reached the class. Lucia is said to have become Mei's classmate and her friends as of today. Lucia's butler, Osamu Mukai, reveals to everyone that Mei, like Lucia, is a candidate for the successor of the Hongo family, as if to take revenge on her. Furthermore, Shinobu even talks about the fact that he was serving Lucia until a year ago. The swordsman, who knew that Lucia was stalking Mei to get her back, enraged her. It is said that he is the man who afflicts Mei (Source: TVDb)