A Good-For-Nothing Knight Will Never Meet a Coquettish Young Lady

(Pure Japanese light novel style) "Magic level E, recognized as a useless knight. But no one knows that I was their lifesaver two years ago. " The eldest twins of the Yreltz family—— The violent and arrogant Milena, the gentle and angelic Kaluya. The daily style of painting is supposed to be about being made things difficult, being bossed around, and living lazily in a mansion... However, an anonymous threatening letter broke the calm: "I accept the 'treasure' in your daughter's body." When the killer really strikes, This useless knight who only uses his brain to fight a stone, How to protect the young ladies he once saved but now completely forget about him? --- One sentence summary: Uselessness is the appearance, protection is the instinct - this is a story about the "hidden strongest knight" and the "redeemed twin eldest lady".