Ibuki and Angie have never canonically interacted, as they both come from two different entries in the series. However, they do interact with each other in Ultimate Talent Development Plan, and appear to be friends.
In Ibuki’s Ultimate Talent Development Plan, if you choose to go to a place with a “psychedelic“ vibe when asked where you’ll perform your “fight song“, you will meet Angie. Ibuki says she finds the genre interesting but it’s not really her type. She also adds that she was expecting to see Angie.
Angie asks if Ibuki came to offer herself up as a sacrifice, which she quickly answers herself, saying that it would be dangerous to extract blood from someone who was skinny like Ibuki. Angie has shown interest in slimmer bodies, as shown during the second trial in Killing Harmony, when she told Kirumi that she had a thin and nice body.
She then says that Atua praises Ibuki’s “devotion“. Atua’s approval is a very important thing to Angie, and most often dictates how much respect Angie will hold for that person.
Ibuki says that the sacrifice experience could be good for a live performance and gets conflicted.
The ship is considered a rarepair, as is the case with most crossover ships. Most prefer to ship within the two's respective games (Angie with Korekiyo and Ibuki with Mikan, most often). However, this ship does have some supporters, due to their similarities.
The fandom recognizes the two as being the bubbly morale boosters, hardly upset even during the killing games when someone has passed. Ibuki enjoys lifting people’s spirits with her music, and Angie enjoys preaching happiness through the guidance of Atua. Their passion for making others happy is what makes them an attractive couple to their supporters.
- “You’re quite skinny, though. It might be dangerous if I extract too much blood...”
- — Angie second-guessing her idea to sacrifice Ibuki.
- “Nevertheless, Atua praises your devotion!”
- — Angie praising Ibuki.
- “But, what if it’s an experience that’ll be good for a live concert...? Ughughug.”
- — Ibuki considering the sacrifice.