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Identity: It's a fanmade MSA anime and manhwa.
Background: In Tokyo, Japan, a 40-year-old woman who is an aunt named Suzuki didn't understand why her 19-year-old niece who is the first protagonist named Ritsuko was so resentful against the idea of having a little sister named Nanami who had been born, either splashing boiling hot water at Nanami to shut her up, or giving her uncooked animal organs to eat. This was because she never asked to become a big sister. But what Suzuki didn't know yet is that Ritsuko wasn't angry, she was grieving, the doctor later told her that her baby brother named Ryounosuke died from an accident involving honey and since that day, she'd seen every women who have little sisters as a threat, she wasn't lashing out for fun, she was protecting herself from more pain, s when her aunt finally discovered the truth, she was shocked and angry. What happens next?