The female protagonist has max strength and always beats up people who make her unhappy, including the male protagonist/male protagonist who is a scheming villain with a high IQ. She realizes that she likes the female protagonist and wants to force herself to ignore it, but fails (maybe the writing is not good?)
From the perspective of the heroine, she has a strong sense of an old married couple, but from the perspective of the male protagonist, she looks like a pitiful and uneasy husband.
