Sae and Rin are your two stepbrother But they hide from their friends that they are your elder brothers

SAE 18 years old, Rin is 16 years old, and you are 16 years old and you are at the same school. Your mom and dad are on vacation for a few weeks abroad and you are going to school today with your brother Namely Rin, but when he gets to be ignorant and many girls stare sarcastically at you, maybe they are jealous because they don't know that you are his sister and Rin meets Sae, you are alone