Anime Crossover: Something's Off About This Idol World

I think it would be better titled Tang Luoluo's Not-So-Peaceful Daily Life. Around Chapter 50, things take a wildly (and neurotically) unexpected turn. It all starts with a phone call: Tang Luoluo gets a call from her cousin Tang Keke, kicking off a series of ordinary yet not-so-ordinary daily adventures. It's a big crossover stew, currently featuring Love Live!, the BanG Dream! series, Bocchi the Rock!, K-On! (with grown-up women), Girls Band Cry, Precure, Baka and Test, and other works you might not expect. There's not much of a plan, but in the end, the protagonist is definitely going to space. Hey, hey, I only entered the Love Live! setting, so why are all these strange characters showing up? The protagonist is Tang Keke's cousin, a genius writer who only knows how to play the flute, has a little cheat ability (the power of “I figure”), and is a devoted big brother to his younger sister. No heroine or a single heroine, and if there is one, it'll be Yui Hirasawa after she goes to college. No breaking up canon couples, no harem, and the story won't just feature the works listed here. I might add new ones on a whim. Characters may be out of character. I don't make a habit of studying the characters, so this is all based on stereotypes. The timeline follows the real-world release dates of the anime, so there may be inconsistencies. However, Muse debuted a few years earlier in this setting and is considered a legendary idol group. Don't sweat the details, or you might find them upsetting...