Also known as: "The Tsundere Older Brother and His Yandere Younger Sister," "A Scheming Sister's Brother-Con Diary," and "Making My Brother Fall for Cross-Dressing"
The diary in the drawer clearly shows signs of having been tampered with. My younger sister has ordered several outfits online that she can't even wear, so why do I keep getting sleepy every night before it's even bedtime?
Damn it, why is my younger sister taller than me?!
She keeps patting my head with a smug smile. Don't get so pleased with yourself! And she says she's the older sister... Huh? I'm the younger sister. What kind of nonsense is she talking about?
D-don't look at me with those terrifying eyes...