[Crossover] Your Brother's Betrayal

Do you like a big brother whose normal attacks hit every enemy and strike twice? Also known as: My Brother's Normal Attacks Are Multi-Hit and Cleave My brother can really fight! My brother can fight too! My brother's cooking is amazing! My brother... My brother can eat shit! My brother... Forget it, your brother has it rough. Certain Vector User: Enough already, I don't eat shit! This is the story of an overpowered, chosen-one big brother helping his little sister find a partner. There are plenty of potential partners. The brother is not a love interest! But if his sister can't find a partner, her brother says he can afford to keep her himself. Theme: With her brother's help, a half-genetically-modified girl grows up and discovers love on her journey through life.