When they started in 2015, they were 13 x3 and 16. They didn't really become famous until Otona Blue in 2023, even though they released the song in 2021. The songs that they almost always do for live shows are "Saisyu Jinrui" which they have been doing every live show since 2020 and more recently "Seishun wo Kirisaku Hado". As for other songs to check out, you should do the First Take version of "Otona Blue", and they will probably do "Nai nai naI". If you are going to HitC, definitely stay for the finale, AG did a duo with Yoasobi last time, and with Rich Brian the one before that. As for other Japanese music groups, I have been listening to Akugi a lot lately, which is rap/J-pop. You may like "R U Serious?". It's a little dark, but the beats are thic. If you are ok with rock, then I would suggest Sokoninaru "Gou ni Moyu" and if you are ok with metal, then Hanabie "Pardon me I have to go now". Lastly if you want to hear the most amazing vocal ability of any human alive today, then pretty much anything by Ado, though maybe start with "Odo" or "Unravel" live.

Atarashii gakko 💕💕🍍🍍🍍