2.928 out of 5 from 42 votes
The Autana beast race is being hunted down by the Lizard Tribe, and only two mercenaries, the human Eita Touga and harpy Aero, have a chance of putting a stop to the threat. But some in the clan don't believe the duo has what it takes – who will win the battle?
Let's keep it short, the main theme of all the manga by Takamaru seems to be monster girls and guess what, both 12 Beast and Monster Musume no Iru Nichijou are monster girl themed. 12 Beast might not be borderline H like Monster Musume no Iru Nichijou, but it's still ecchi, so keep that in mind if you want to pick one of those manga for reading.
Both of these manga are written by the same author, and both just happen to be about monster girls. Monster Musume no Iru Nichijou borders on hentai a lot of the time, and while 12 Beast never goes nearly that far it's still definitely an ecchi title.
Both manga are short fantasy one-shots written by the same dude and both are monster girl themed. While neither is as much on the ecchi side as Monster Musume no Iru Nichijou (which is another manga by the same author), 12 Beast is still more ecchi than Deadline Summonnr. If you read one, you might as well read the other, but don't expect anything mind blowing.