I have some concerns:
1. don't they stream with cameras? chapter 1 page 10, you can see camera on monitor. Also subscribers said his sister is cute so they saw them?
2. if they indeed stream with camera and both MC and Ayaya (or whatever her nick is) watch their streams (its hardly to believe they wont and as i recognize she said she saw that stream with sister) - wont they recognize themselfes in real life?
3. as
@byzantinesoul said - don't they recognize their voices and even her unusal dialect?
4. i hate it when characters hide their identity as its something bad, maybe for japanese people its reasonable, for me - Polish - it's not. We are proud of who we are and rarely hide our hobbies/employment/personality - if you don't like my true self why even bother?
They should simply move through path of Horimiya.