I've avoided watching this anime for a long time. I'm a big time travel fan, I think time travel anime has insane potential and there have been absolute time travel bangers and I made it a rule to watch every big time travel anime, but Summertime Render, everything I saw about it, the posters, the premise, nothing made me want to watch it.
But BOY was I wrong. So, so very wrong. This anime is a masterpiece. Like a genuine masterpiece. Well, ok, maybe not, but it's really fucking good. Like REALLY good. If I was to summarize it, it's ReZero but not stupid. And it's a full complete story, with a beginning and end in 25 episodes. It also has a better protagonist.
The mysteries are slowly revealed over the course of the story with new context added to past events, as you'd expect from a time travel anime, characters are fun, enjoyable, and maybe most important of all, they do a lot of things with the plot that you wouldn't expect. Some things you can predict, like in most stories, but other things, they don't go for the obvious. Even more, they kinda "subvert expectations" a bit but in a good way. Especially with the ending. You could say "well that's just how time travel anime works", and yes, I agree, that's why it's so good!
I'm not saying it's flawless, some characters make little sense, some story parts are ridiculous, the ending is kinda rushed, but still, the overall package is amazing. Especially compared to some other stuff that is out there.
And a great 10/10 waifu to boot.