An unaired episode included in 11th volume of the Persona 5 the Animation.
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Few days after battle against Akechi. Ren, who was helping out with the cafe, saw a cross word puzzle magazine on the table and saw Akechi's handwriting besides a solved crossword "Seigi no Akashi (Sign of Justice)." In order to investigate the meaning, he walks around the street under the cold winter snow while thinking back at the memory with Akechi. The meaning that revealed and Akechi's feeling is...

PERSONA5 the Animation: Proof of Justice