It's from the Monogatari series. If you want to watch it, I recommend in this order: [spoiler]Nekomonogatari Kuro Bakemonogatari Nisemonogatari Monogatari 2nd Season Tsukimonogatari Owarimonogatari[/spoiler] There is a lot of fan service, but it's a legit anime. Probably the only one where I don't mind the constant fan service.