Manga by author Yoshikawa Hideaki

From MangaHelpers:Haruki is a teenage boy who has two friends that are not very ordinary. Ayana has been transformed to be part dog, as shown by her dog ears and tail. Ayana also has enormous lactating breasts. Airi, on the other hand, is a cyborg girl, and she's got tons of mechanical gadgets. The story begins when Ayana and Airi both want Haruki to join their club, and Haruki must pick one over the other. Ayana's science club has more to do with transforming living things, whereas Airi's has to do with more mechanical science. Their attempts to persuade Haruki to their side tend to be full of nudity and sexual arousal. Haruki is going to have a bizarre school life. [tethysdust]

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Beings that create and control monsters and demons, beings that build and reign over malicious labyrinths, the chosen individuals to possess an overwhelming Unique Skill They are the Demon Lords.Demon Lords entice people to come to the labyrinth they've built and eat the people's despair as their nourishment.However, Creation Demon Lord Procell has decided that he will obtain people's hopes and not their despair as nourishment, and built a happy town instead of a malicious labyrinth to collect human beings.This is the story of an eccentric Demon Lord, with all its ins and outs.

The power I posses is the strongest in this world! The enemies I must defeat... are humans!?I was Suddenly transported to another world. Being called the Suitable One', with the world's strongest power "Holy Sword". I thought I would be using that power to make a great impact in this new world. However, in this alternate world there are "inhumans"; Monsters that oppress the lands. Questioning my own convictions, I ask, is this correct? Who should I use this power for? This is the beginning of an Isekai battle fantasy!