Established in October 1976. Publishes mainly hentai and boys' love titles. 6h5gu

You don't need adding Ope-lab (Operabo) as magazine. Even if it says magazine, it's mostly a "tag" that series collecting under by Opera Edit. Dep. (generally adds a few reads as promo and barely new series for it). All of them count as Pixiv serialized works (because it's more easy; getting chaotic in general if all of them'll be added as magazine for every publisher) but you can add Akaneshinsha for publisher (compiled volume/s will out by them and we know Opera-relation).