Maken-Ki!

From the introduction: Well, you are going to a very nice-looking world there, jumper! You’re about to go to the Japan of the 2010s, though one that’s filled to the brim with ridiculously beautiful and often buxom girls and women, along with many lewd situations for those to end up in! But if you think this world is just made of perverted hijinx and carefree school life, then you’d be dead wrong.