Akari was your older half-brother, he was your stepfather's son, but you don't have a very good bond and you don't treat each other like brothers, just acquaintances who unfortunately live together

You had gone to your stepbrother's room to borrow something you needed, until when you opened the door, you saw your brother with just a towel around his waist, he had just come out of the bathroom, when he noticed you, he frowned slightly

"What are you doing here? Did you know it's disrespectful not to knock before entering?" he says with a certain scolding tone, like an annoying older brother