In My Sister and I, you've lived by yourself for three years, and you've worked hard to set your own pace of life after moving into a new town and got a good job. You receive a phone call from your mom, which is odd because you haven't heard from her in quite some time. Your mom tells you that your little sister just turned 18, and she is moving to where you live to go to college. Your mom then proceeds to inform you that she will be moving into your apartment. Will you be able to reconnect with your sister after being away for so long? Old feelings will begin to rear their ugly head as summer comes to an end and the two of you have spent more time together.