ONEZ-271 Why is the older sister who used to be cool working at a delivery health service? Yayoizuki Mizuki

My sister used to be cool and someone I looked up to. But one day, she changed. She suddenly stopped coming out of her room and became a recluse. The cause was excessive expectations from our parents and bullying at school. My sister even quit school and spent her days like an empty shell. However, one day, a turning point came. She started working part-time. It's also for rehabilitation, so she only works for short periods. My sister gradually regained some energy. But I accidentally found someone who looked just like my sister on a delivery helpline website. That was the beginning of it all…