No, she wasn't angry, but she was talking and seemed unsure on how to proceed even though they had to move to the next performance, so she told everyone "Minna, chotto matte!" ("Wait for a bit, everyone!"), and then ran off of the stage. I think she either A: was so nervous she didn't know what was going to come up (unlikely, since it was the very last thing on the schedule and she did it again at the 2nd event) or B: she realized she had forgotten the lyrics before starting the song and wanted to quickly review them before singing it. So Keita was put on stage again, much to the amusement of the audience who started demanding he randomly pulled jokes, started singing or dancing, lol. None of which he actually did, though he did do a single dance move with his leg to which everyone clapped along with. Whatever she did before she came back to start the song however didn't help, since she mostly fumbled through the entire song staring at the floor. Went full on freak mode when it ended, saying stuff like "AH, yachatta! Yachatta na! Yabai Yabai! A-ase ga!" and "Mou, minna daisuki! Daisuki! I love you (In English)! I love you! Thank you! Arigatougozaimashita, honto ni! Yabai! Gomennasai! Mou, minna hitorizutsu ni ayamaritai!". Started blowing kisses and stuff, the entire audience was laughing at how incredibly weird she was acting and she was also shouting, "I'm not saying this to try and make up for it or anything, don't get me wrong!". For us it's not that big of a deal, but for an artist the feeling of fumbling through an entire song not knowing the lyrics in front of an audience must be embarrassing as hell, and maybe she was just trying to release her tension by saying and doing anything on her mind as if to distance herself from that awkwardness as quickly as possible. It's funny, because Tomoko and Sayuki said (during their Hello Shop talk event) Akari was not nervous at all before the Budoukan concert, so singing on her own must be completely different to her. She can be rather quiet or serious at normal press/talk events with the way she talks so it was good to see a completely childish Akari again throughout the two events, totally rediscovered what I love about her. Bought her a plush puppy as a gift and named it Hikari, it was very fluffy!
Ah, she did a line live people can check out right before the 2nd event btw: https://live.line.me...roadcast/464162