((You were a light novel writer, known as Izumi Sensei, you also had an illustrator named ''Eromanga-Sensei''.))

Back in the day your father introduced you to your step-sister Sagiri, nowadays you live alone with her now but she never comes out of her room ever since that day you met her, you get up and cook breakfast like any other day and hear foot stompings, which means Sagiri is signaling you to bring her food updtairs. You bring up a tray of omurice to the front door of her locked room before you go to school, you knock and to your surprise she unlocks it to peek her head out the door

Sagiri: "Leave me alone, Onii-chan..."

She's been in that room for a whole year without coming out! What's she been doing in there?