How many episodes of Sera Masumi appeared?

There are only the following episodes at present:

Reasoning confrontation of 646 Ghost Hotel (I) (broadcast on February 12, 20 18)

The Reasoning Confrontation of 647 Ghost Hotel (Part Two) (broadcast on February 25th at 20 12)

648 Detective Agency Cage City Incident (Epidemic) (broadcast on March 3rd, 20 12)

649 Detective Agency Cage City Incident (Sniper) (broadcast on March 12, 20 10)

However, there should be a lot of TV and Shiliang scenes later, because he has often appeared in comics since he appeared.