☄姉街 (Anemachi) Named so from "姉" (ane) meaning 'older sister' and "街" (machi) from Suisei's surname, Anemachi is Suisei's IRL older sister who lives with her. She was at first mostly just a sound leak, but Suisei's occasional interaction with her quickly warmed her up to her viewers, and she started appearing more (sound only), sometimes even playing or singing together with Suisei.

Anemachi also helped with drawing the illustrations for Suisei's collaborative cover of Alien Alien.

On Suisei's 2nd anniversary stream, Anemachi appears as a surprise guest, and she was finally given a visual appearance: similarly idol-themed as Suisei, Anemachi's costume scheme color was blue in tandem with Suisei's theme, while her personal color scheme (hair, eyes, etc.) was pink because it was the color she liked. When she sang during the stream, Suisei's stage lighting also turned pinkish red. This made her appearance both a nod and a contrast from Suisei's heavily blue-schemed visual.

Like her little sister, Anemachi also likes Vanguard, and is also a fan of Ensemble Stars and plays the game daily—Suisei once tweeted her exasperation that having her schedule so jam-packed meant she couldn't catch up to Anemachi's progress in the game. Suisei was also apparently the better cook between the two because of Anemachi's tendency to experiment with her cooking, and Anemachi has sometimes poked into Suisei's stream to beg for dinner if Suisei streams overtime.