|Protect the Secret Base!|
|Japanese Title|| Himitsu Kichi wo Mamore!
|Episode №||17 (167)|
|Air Date||May 26, 2002|
|Episode Direction||Yoshihiro Oka|
|Animation Direction||Mikine Kuwahara|
|Next Episode||Where There Are Woofs, There is Love|
|Previous Episode||How to Make a Rainbow That Doesn't Disappear|
Doremi and the girls find out that the boys in the 6th grade are hiding out in a secret clubhouse, home of Miyamae's homemade airplanes. The girls offer to help out, but unfortunately, Reika hears of this and tries to exploit them.