“Auntie Sachiko, didn’t you die?” Wakaba Akira, Mutsumi’s adopted son, a famous second-generation star and the most highly anticipated idol of the new era, transmigrates to his mother’s high school days and meets Toyokawa Sachiko, who had died long ago in his memories. The great Auntie Sachiko of his memories met with an accident not long after C-Group disbanded. Her passing was like a whale’s fall, nourishing all life. It shook everyone, and those who carried on her last wishes stood side by side and reached the top of the music world.
...Wait, what’s Auntie Sachiko doing? What’s MyGO!!!!!? I’ll save Mom from her regrets! You all have to stay in a band together for the rest of your lives! If MyGO!!!!! is going to steal Auntie Sachiko away from Mom and the other aunties, then I’ll just steal all of MyGO!!!!! instead!
But as Akira gradually gets to know them, he realizes that these “aunties” aren’t quite like the ones in his memories...
“Soyo, you can’t do that!”
“Taki, you’re my favorite auntie. This isn’t right...”
Wakaba Akira realizes that, without noticing, he’s become the center of a terrifying gravitational field.
“Don’t be scared, Akira!” At the crucial moment, Anna Yanami descends from the heavens. “Your System is in my hands! How could I let anyone interfere with my Handsome Boy Grooming Plan?”
“System! Give Akira a boost!”
