Quicky: if you ever get the chance to visit Don Quijote (Donki for short), do so. One of such shops is very close to Suehirocho subway station. (between it and Akihabara eki, station actually).
There are arcades, Pachinko & Slot, a maid café (with a waiting line), a whole floor and more dedicated to AKB48, lots of Love Live stuff and everything else you do or do not need.
There’s even a small selection of sex toys for him and even her. I think customs might give me a hard time if I were to bring any of that with me. xD