| Subject | English | Japanese |
| inf. | n graduate of the same middle school | 同中 |
| inf. | n graduate of the same middle school | おな中 |
| gen. | n same school | 同流 |
| gen. | n same school | 同校 news1 nf08 |
| gen. | n same year in school | 同学年 |
| inf. | n student at the same middle school | 同中 |
| inf. | n student at the same middle school | おな中 |
| gen. | n the same school | 同学 |
| gen. | n the same school | 同窓 news1 nf22 |