This is a complete set of The Promised Neverland manga. I purchased all of them myself and have read them several times. I checked briefly, and volumes 3, 5-20 (17 books) are first editions. Sorry if I'm mistaken. Some volumes don't have obi strips. I've read them a few times and kept them on a bookshelf. They haven't been exposed to direct sunlight, but please judge the condition of the books based on the photos. I think I'll send them via Mercari delivery service.