(Capcom's primary storyline)
Masaki T. was a Japanese businessman who served as a senior executive within the Umbrella Corporation.
As a senior executive in the 1990s, Masaki was granted the security clearance of Level 10. This and Level 9 allowed staff to know the highly-classified details behind Stairway of the Sun and the location of the Umbrella Africa Laboratory where Progenitor Virus cultivation was undertaken. Following the destruction of Raccoon City in 1998, Umbrella CEO Dr. Oswell E. Spencer, Earl Spencer began purging the Level 9 and Level 10 executives to protect the company's secrets. Masaki died at some point before 2006, either purged or through other means.
- Resident Evil 5 (2009), file: "Spencer's notebook"