This manga has the title of being one of the first adaptions of Isekai as a whole. After re-reading the whole series, I can vouch this specific series is good. Sure there is the harem feature, but the characters themselves are unique. Everyone has their own distinct personalities, there is nothing dry or bland across the story whatsoever. The common flaw with "harem" titles centers on soul less people? Like females with no personalities or relying on tropes for development. Luckily this title is not like that, each character has enough room to explore their lives, explanations for details, enforced with decent action. The MC is a good guy,he may be naive at times but he walks the talk. Plus the idea of creating skills, mixing, merging, bonding works well. The ecchi factor is a little high but I can respect that with a great story.