If in AKIHABARA is like HEAVEN for OTAKU who loves WAIFU. IKEBUKURO is HEAVEN FOR GIRLS (OTOME - girls who like fantasy anime boys)
This place is full of OTOME stuff. Please google the word OTOME before set this place into your itinerary.
MANDARAKE - is an underground shop. SPECIFICALLY FOR OTOME. In this shop you can find ADULT COMICS for girls. Full of YAOI (BOYS LOVE). Google the name and the details before start entering the world of OTOME xD - some might disgusted with the GENRE but hey! We are not judging boys who loves WAIFU.
ANIMATE - Mainly a building with several floors you can shop and visit. There's cafe, cosplay, dolls, gatcha machine etc.
K-Books - FOCUSING ON ANIME in general. but still leading to male character and full of Otome Games character merchandise selling in their shop.