Keijo!!!!!!!! (that's 8 exclamation points mind you) is a low fantasy sports shounen with a gimmick that ends up being far more entertaining than it has much right to be. But if the consistent level of outrageously new and unique ass-attacks doesn't make you laugh, you won't find much to hold your interest here.
See, Keijo!!!!!!!! exists somewhere in between "so bad it's good" and "surprisingly good" for me. It feels like it takes a checklist of everything a shounen is and goes down the list, fulfilling the obligations with quality that vaguely surprise me, but with virtually zero creativity.
It has a lovable, if clumsy and
dull-witted, protagonist who pulls genius ideas out of her ass in battle. It has a parade of characters with a gimmicky way of battling in what seemed to be an otherwise straightforward contest, with matching gimmicky personalities and lightly-touched-upon backstories. The main story features said protagonist on her journey to become the best at the sport of Keijo!!!!!!!!, or at least good enough to make oodles of money. Thus far, as of Chapter 69, it has mostly featured the protagonist applying for and training in a school for the sport while facing off against various ass-themed challenges and opponents.
The art matches the story: it's acceptably done but not exceptionally. Character designs are identifiable and pretty, if vaguely forgettable at times. Environments and objects are clearly defined, but not impressive. Asses are... fine... I guess? Not my area of expertise. Feet are wonky, but that's surprisingly common in mangas, and the author cuts the feet out of the shot where ever it wouldn't interfere the shot (something you will now be unable to unsee in manga mwahaha).
Keijo!!!!!!!! is, in a sense, the ultimately generic sports shounen. But then there's that gimmick, which I find endlessly hilarious and brings the manga from a 6/10 to a 9/10 in my mind.
Yes, ladies and gentlemen, this is a low fantasy ass battling manga. And the asses are absolutely hilarious. Every fighter has a specialized ass technique to call their own. There's the relatively simple double-strike called the Ass Hurricane. If you can get above your opponent you can pull off an Ass Meteor or an Ass Guillotine depending on style. A recently shown ability is a pair of twins cooperating to create a literally dazzling Shooting Ass Star. From the immovable object of the Vajra Ass to the unstoppable force of the Vacuum Ass Cannon (a personal favorite) to the unbelievable speed of the Ass Gatling. One fighter has such accuracy with her ass strikes that she can surgically strike weak points on the opponent's body (such as the solar plexus, nape of the neck, or an unnamed spot and angle on the jawline that collides it into your brain), and instantly disable them, knocking unconscious 2 or 3 weaker opponents in the blink of an eye.
I could go on, and want to, but won't, because this is a major draw of Keijo!!!!!!!! to me and could be for you too. Seeing all of the outlandish and ridiculous ways the author comes up with for girls to attack each other with their asses just makes me laugh every time. If you need a story you can handle not taking seriously, one that will deliver on hilarious ass-themed outrageousness, then Keijo!!!!!!!! delivers at a somewhat generous 9/10. If you're bothered by how ludicrous and over-the-top it is, or if you're somehow totally unmoved by the ass ridiculousness, then you'll be underwhelmed by a 6/10 generic shounen.