it’s hentai

I dont think so, official site list this under TL genre (Teens Love - a genre whose target audience are from late teens and above, a romance with smut/sex --- not even close to Mature genre whose target audience are adult).. Also after reading the chapters, the *things* that needs to be done in ecchi genre are not present here such as ahegao, bukkake or even tits F, none of them are present, so no its not a Hentai ヾ(❀╹◡╹)ﾉ~ ... Hope this enlightens you (▰˘◡˘▰)