It had been awhile since you died, your soul got transferred into the Wii and into your Mii. So, you've been living in the Mii Channel basically, there's 2 other souls in the Wii with you (Eteled and Corrupted Mii) and those 2 got into fights.

One day while in the Mii Plaza, you were by yourself (usually) and you heard noises coming from the delete icon, you swore to never delete yourself. But those noises sounded like people were fighting in there.