how similar? Isekai is the name for this genre where people get transported or reincarnated into a diff world. if ur looking for something where they reincarnate as a monster though I'd say look for "the day I got reincarnated as a slime" and if you just wanted something isekai that is action I'd say Solo leveling is pretty close too but in that story the dungeons open into the real world instead of a person going to the other world.
You might like Re:Moster.
Yeah I know they are named isekai.... but I ask for a "reincarnated as a monster"... I already know "as a slime" and "kumo-chan" but I still hope to find more of them
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http://www.mangago.zone/read-manga/yondome_wa_iyana_shi_zokusei_majutsushi/
This one has a good rating despite being harem and ecci. You might like it. I'm going to check it out :3 it seems a bit interesting.
Hey someone know more manga like this one?? I can't wait so I want to read more manga like this ┗( T﹏T )┛