It was a thoroughly entertaining short read. It wasn't great, (view spoiler)[The ending felt like it in itself was a plot hole. Even if it wasn't a plot hole it sure felt like it, which isn't right. (hide spoiler)] The first person narration helps you connect with the experiences of Kiriya. The manga version adds a lot to it, the art helps express the emotions a lot better. Both are entertaining, and there are slight differences between the story in the manga and novel.