Secret Library
Before leaving for Choco, search the area approximately five spaces right and seven to nine spaces up from Quintenix. Starting from Quintenix, fly to the right just past the first yellow star. Then, fly upwards until reaching an area with a small blue star to the left and a large yellow star to the right. The planet Kirara is located between those stars. The library on Kirara contains the complete Inventor's Friend collection.