Project A-ko 2: The girls are back in town, and this time, B-ko's father gets involved. Ever wonder where she got that strange mixture of genius and insanity?
Project A-ko 3: What happens when a single (unlucky) man comes between A-ko, B-ko and C-ko? And what happens when that single man likes only one of the girls? Mayhem... and Project A-ko 3!
Project A-ko 4: A mysterious discover on an archeological dig kicks things off in this last installment of the original series... and the girls' school teacher, Miss Ayumi, is somehow mixed up in it! To make things even weirder, C-ko's mother shows up... and that's where C-ko gets her rather distinctive personality!