These can be done in any difficulty and match settings.

Item	How to unlock
Unlock MOE	In DRAMATIC mode, complete all the courses and defeat her in the last match (L).
Unlock MONA	In DRAMATIC mode, defeat her in the second last match (K).
Unlock item "patto"	In PRACTICE, MACHINE mode, successfully hit all the 100 balls (Perfect). Equipping this item enhances the bust size of the girls.
Unlock outfit "zenshin taitsu"	MONA and MOE must first be unlocked. In FREE PLAY mode, defeat every single opponent with any character.