| Satoshi Tezuka | |
|---|---|
 | |
| Age | unknown |
| Gender | Male |
| Affiliation | Future for Our Libraries Research Group |
| Rank | Head of the Future for Our Libraries Research Group |
| Relationships | N/A |
| Family | Hikaru Tezuka (younger brother) |
Satoshi Tezuka is Hikaru Tezuka's older brother. He is the head of the Library Association of Japan. In his ambition to have his brother to join him, he becomes an antagonist.