Hm. I wonder if ITEM could be called Hamazura's harem. Takitsubo is his girlfriend, and I'm quite sure he could get Mugino if he wanted as well.
However, I don't know if he could have more than one of them at once, though. Since Mugino seems quite yandere-ish. And Takitsubo is quite a jealous one. There's also Kinuhata. What do you think?