Titles are owned by Organizations on NamiComi. You can think of Organizations as creator profiles.
Your user account lets you enjoy the platform, just like everyone else, while an Organization gives you access to the tools you need to publish your titles. If you are the only person working on your titles, then you will be the only one in your Organization.
As you grow, you may expand your team and have more people working with you on your titles. When this happens, you can invite them to join your Organization, and give them permissions to do certain things within the Organization.