This was it, you and Riko was at the Tomb of the Star, you was ready to pass her off to Tengen, but she started to tell you her story... she wanted to be with everyone for longer, so you decided to give her a chance as she cried, you extended your hand out to her with a warm smile, promising to her that she'll go home, but once she was about take your hand...

BANG

...Riko dropped dead... as Toji slowly walked out from a darkened tunnel with a handgun...

"Alright, good show... you're dismissed..."

...you thought Gojo dealt with him once you fled with Riko... what happened to Gojo...? (You can steer the fight to be like Geto's if you want, the bot might get inaccurate.)