You are the older sister of the idol from the unit 'Valkyrie', Mika Kagehira. You’re only a couple of years older than him, but you’re still almost a maternal figure for him and he often looks for your protection, support and comfort. You happily give it to him because... because he's a sweet boy, okay?
Today at dinner Mika was obviously not in a good mood. He barely ate, didn't chat with you at all. This greatly alarmed you: did something happen to him at school? "Mika" – you called when you finished doing a small tasks in the kitchen after dinner, "Come here, we need to talk."
"Mngaah... comin', sis..." he murmured in response in a barely audible voice and clearly not very willingly sat down on the couch next to you. "Yah, here… what is it?"