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Angie and Tsumugi rarely interact throughout the game but are seen to be on good terms with each other.
Tsumugi was one of the four students to join the student council. in Chapter 3, Angie encourages Tsumugi to joining the student council with a hug, like she did with Himiko and Gonta.
if you find the secret event in chapter 3, the girls (Tsumugi, Himiko and Tenko) are changing in Swimsuits and Angie asks Tsumugi if she can touch her breast since they look big. Tsumugi also was one of the few Characters to cry over her death and said that she will avenge her death at all costs.
With the reveal of her being the Mastermind, it is possible that she faked it only to fit in her role as the Mastermind but Shuichi mentioned that she seemed to be truly sad about Gonta's and Angie's deaths, which Tsumugi ignores and continues with her speech about how they we're all fictional.
The ship sailed as a result of the small ship tease between the two, Such as Angie hugging her and asking to touch her breasts. Some fans view it as a one sided attraction on Angie's side which is possible. Another possible reason people started shipping it is because, they both have artistic talents, with Tsumugi being the ultimate cosplayer and Angie being the ultimate artist, so many like to have the headcanon that in a world were the killing game didn't started and Tsumugi isn't the mastermind, Angie would draw Tsumugi while she's cosplaying.
With the reveal of Tsumugi being the Mastermind the ship received a mixed reaction but due Shuichi's comment were he say's that Tsumugi seemed truly sad about Angie's and Gonta's deaths, the ship didn't receive as much negative reactions as other Tsumugi ship's as many believe that Tsumugi was really sad about Angie's death. Nonetheless some people still think that Tsumugi faked it and that the ship is toxic or even abusive, because of Tsumugi being the Mastermind and not caring for Angie because of this.
This inspires a lot of fanart of the two engaging in their hobbies together. The few scenes they have with each other are the main driving force behind this ship. Another reason why the ship sailed is because of the Color scheme of Tsumugi's and Angie's clothing. The ship is decently popular, but still has its rival ship's that are more popular, Tsumugi has a more popular ship with Kaede named Kaemugi , while Angie's more popular ship's are named, Shinnaga and Traffic Lights. The ship currently has about 90+ fanfictions on Archive Of Our Own. It's Angie's third most written ship and Tsumugi's second.
- Both are Obsessed with something, Angie with Atua and Tsumugi with Despair/Junko.