Very cute manga that captures exactly what you imagine what you think a 'speedrunning isekai' would be. Fast, to the point, but enjoyable. It really is a breath of fresh air compared to the usual videogame isekais protagonists find themselves stuck in so often. The characters, villain or not, behave realistically when confronted by someone who can completely break the situations they fumble into which is the main appeal. Highly recommend giving it a look over if you're interested in isekais or speedrunning- both would be best but either is fine. There isn't much more to say without giving away some of the best jokes buteveryone reacts about as well as you can when confronted with someone who competes to kill the Demon Lord as fast as possible with others from all around the world. It gets nutty in all the right ways.