[Short Story Version] My Fiancé Fell in Love with My Sickly Sister, So I'm Leaving the House. It's Okay for Me to Find Happiness with My Guard Knight, Right?

My fiancé caught sight of my sickly younger sister and fell in love at first sight, so he apparently asked my parents if we could exchange partners. My sister is pure and cute, and on top of that, she has a good personality, is obedient, and is adorable. Even if I were a man, I'm sure I would think that she's better than me. ......This isn't their fault. It's unavoidable. But if I'm just going to be in their way, I'll run away from home! ♡Scheduled for electronic book release on 8/22 at Sherry love Novels. (Illustrations by Nitaka Sensei) ♡Manga adaptation by Yotsuha Rako Sensei, currently serialized in Takeshobo's Takekomi! Manga adaptation title: "The Doting Strategist Guard Knight Wants to Be Mean to the Pure-Bred Young Lady." ※Former title: "My fiancé fell in love with my sickly younger sister, so I'm leaving home. Please don't look for me." ※It has been expanded into a longer work (https://ncode.syosetu.com/n7306je/). I'd be happy if you'd enjoy it. ※Posted on Kakuyomu and Berry's Cafe.