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It a manga about a woman who has a store with a collection of items that have mysterious powers .It always grant short term happiness but the owner will always abuse it causing it to back fire. One story has a kind but plain sister who gets a mirror that grants inner beauty on the outside .She gets beautiful but when she see her pretty younger sister get jealous of her new face she blackens. She steals her sister boyfriend so the younger sister try to steal the mirror but it makes her ugly .
She shows the older sister the mirror and because the older sister heart became ugly she becomes ugly too.
Stable Time Loop
My theory is ML knows the uke will time travel to get revenge so he has to act a certain way to get him to meet him in the past.
Later the uke will find out it all a misunderstanding and the Ml true self is more like a dog gong . I am just guessing after reading a couple chapters so this is all in my head .