Ring no Seraph

Both about wrestling matches including colourful characters and animation, both are fairly short (only a few minutes each) if you like one of these i can easily recommended you to try out the other to see if you like it 

Both songs are made by the same person and the animation style is similar between both videos, this creator has also made Freely Tomorrow which is listed on MAL but the animation style is different, not that you watch them for the animation anyway. 

Cute girls in skimpy outfits doing wrestling.