Hurr durr, Persona 4 reference. Yes.
Just a little sneak peek~ Though, this isn't what the final product of that cutscene looks like.
What is Risotto's past you may ask?
Risotto's cousin was killed in a road accident caused by a reckless driver, though he was jailed. Risotto would never forgive him. When he turned 18, three years later, he hunt down the cousin killer and assassinate him. He then shortly joined the gang.
The reason why Risotto wore sunglasses as a teen is because he was insecure about his eye color before he gets into his goth phase. That's JoNO canon.
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