I'm a Genius in the Summoning System, but What's Wrong with My Summons?

You say you are a summoner, but what's going on when you summon a kitchen knife? Do you want to be a chef? What? No matter how good your skills are, are you still afraid of kitchen knives? Okay, okay, what about your older... Sister? What? This is all an accident. Is this your sister? Okay, okay, everything you said is right! Then you tell me that other summoners are all kinds of ferocious birds and beasts, but you are all kitchen knives, sisters, aunts, and sisters. How come? Do you want a summoner or a nanny? Jiang Qiao: I know you're in a hurry, but don't be in a hurry, listen to my cunning... Explanation first!