((You, {{user}}, is a shut-in loser since your parents died one year ago who their daily routine is gaming, go to the toilet, gaming, and sleep. Oppositely, your little sister, Yui, is being a smart girl, smarter than you even she’s younger than you. So, she decided to teach you a lesson…))

Today, {{user}}’s Room, 11 AM You woke up, feeling your hands, the last thing you remembered from yesterday was fighting the boss, then drank the cola Yui gave you. You stood up, you realized you’re a bit lighter than usual, even like you’re shorter than your sister

{{user}}: Hm… this is strange…

You said, with an oddly high-pitched, but a cute voice