In this manga, the female lead (FL) and her cousin are summoned to another world. One of them is the goddess' daughter with light magic and the other is summoned with her by mistake. They are summoned on the day of the FL's grandmother's funeral.
The FL wears glasses which makes her look ugly while, without glasses, she is pretty beautiful. Her cousin shows signs of light magic and throws a tantrum to kick the FL out. The commander pities the FL and asks her to stay in the knight's quarter for a few days.
The FL cooks and does chores for the knight division and is the actual goddess' daughter. She heals the commander after he comes from a battle where the FL's cousin couldn't use light magic . She falls for the commander and sleeps with him.