Ooigawa Mamoru
大井川 護
| Ooigawa Mamoru大井川 護O | |
| Birthday | 6 March |
| Age | 19 |
| Hair | Brown, Short |
| Eyes | Violet |
| Body | Teen |
| Clothes | Happi |
| Personality | Lazy |
| Role | Journalist, Non-blood-related Brother |
| Visual novels | Side character - Getsuei no Kusari -Sakuran Paranoia- Main character - Getsuei no Kusari -Kyouran Moratorium- |
| Voiced by | Miura Hiroaki |
DescriptionThe protagonist's non-blood-related older brother. He has entrusted the house and store to his sister and works as a newspaper reporter. Mamoru always looks sleepy and has a listless attitude. | |