4 books in series
Challengers
Challengers is a 4-book series with 4 released primary works first released in 2000 with contributions by Hinako Takanaga and 高永ひなこ.
| #1 |  Challengers, Volume 01
| 3 | 1 read | ||
| #2 |  Challengers, Volume 02
| 3 | 1 read | ||
| #3 |  Challengers, Volume 03 Challengers, Volume 03
| 3 | 1 read | ||
| #4 |  Challengers, Volume 04
| 3 | 1 read |