To those who want to get into Shadow Soul Rui Route

[Algester]

Tell Suzu to get out of the Park in 'Chasing the Black Haired Girl'
Tell Rui 'You want to meet her'->'...It was my first Kiss'->'I couldnt' get the Kiss out of my head'
in Meet-Up With Rui->tell her about Red String of Fate->Laugh at her obvious bad joke->When you ask about Mother Soul->Agree with her views->ask anything else
in DBP Plot Agree to her plans
in Akiba's Beat tell Suzu to hide
in Rui's Date well do what you must 'Win Against her 3 times and get Arcade Addict and then lose', 'What's this now', 'Tell her about your friends'
in Mother's Soul arrive 'she should go to her mother' and then 'You want to work with Everyone'

same dialogue tree could also be the key towards Coexistence route
during Coexistence route in Paparazzi just tell the client anything but 'you are no Father' as this will fail the one of the needed requirements
take a picture of Rui discreetly 'shoulder button+square' will automatically make your picture in 'normal mode'
return to the client asap
tell Rei 'Rui's Father is nearby'

you are free to murder Yu Abeno during this route if you want his musical axe... if you wanna be mr nice guy spare him in his first encouter (tell him to scram) and then spare him again

Yu's Musical axe can also be acquired during NIRO's route so... the choice is yours if you want Mr Nice Guy achievement

[The_Azure_Striker]

Dumb question, but does asking Rui for a picture of her mess up any requirements? Just curious given the options

[Algester]

yes it will also mark failure in the subquest she must not know anything about it