When Nakanishi-kun saw Shinobu-kun and Fumi embracing on the street, the scene conveyed his inner thought: “Isn’t that Sakura’s manager? ...”
This was the last time Nakanishi-kun left an inner monologue in the manga. After that, all of his interactions are conveyed through “spoken words”: you can hear what he says, see the changes in his expressions, and observe his actions, but his inner feelings alone are hidden. From that point on, readers with a god’s-eye view can no longer clearly see what he is truly thinking. Perhaps this suggests that he has begun to move into the role of a shadow character.
Even when Nakanishi-kun is alone at home just after taking a shower, and sees LINE messages from his childhood friend and from Sakura, his first reaction is presented through him talking to himself rather than through genuine inner monologue.