With serial number, the special items from Movic are selling for 19,000yen (about $170 these days) through June 28th.
Prior to that, there was a Dengeki and Nico Nico meeting in an Oreimo x Eromanga sensei crossover webcast.
Back in December, Kuroneko hinted to her fans that she’s be showing up in the anime adaptation of her creators’ (Tsukasa Fushimi and Hiro Kanzaki) Eromanga-sensei.