Collector interest
A 3DS adaptation of the ecchi anime High School DxD, published by Kadokawa Games and kept strictly Japanese for want of an exportable license. Its fan-service content limits it to franchise devotees, but it is exactly that niche, paired with a short local run, that sustains import demand. The 3DS region lock tightens the hold: the cart runs only on Japanese hardware, making it a target for collectors of anime tie-in games.