For me, some of Chase Atlantic's songs strongly remind me of Togame, but the main one that stands out to me is "I Don't Like Darkness." Before that, we see Togame as a bully until the end of the fight. During his fight with Sakura, we discover through his fists why Shishitoren ended the way it did. It shows that Chouji invited Togame to Shishitoren after seeing him beat up some guys and praising his strength. I think that seeing how Togame used to be, it's noticeable that he wasn't someone who lived surrounded by friends or anything like that. This is also one of the reasons why Togame wanted to commit to Chouji's idea, even though he thought it was wrong. He valued him and wanted him to continue having fun, being the sunshine of Shishitoren.
One of the things that also makes me realize or get the idea that Togame was lonely is about his hobbies. The idea of a teenager like him playing "Go and Shogi" with elderly people at that age and spending time in public baths seems kind of lonely, doesn't it? Because we see how others are surrounded, even if it's only a little, they still are. And yet we see Togame only having Chouji as a fixed link.
Then we have our famous fight between Togame and Sakura where everything changes. Sakura, empathizing with Togame, tells him that he should change and stop with these twisted ideas. That he should be a nice guy, where we can see in the manga that he really tried.
Now, some excerpts that led me to this conclusion are:
"Hard to stay awake, I'm so exhausted"
"Hard to keep a friend, I guess I'm cautious"
"Funny when my head caved in, I thought I'd lost it"
"Might have had a date with death, I guess I dodged it"
"I don't want to feel this pain, I don't like distance"
– During his fight with Sakura.
"I don't wanna leave this place if you're not with us"
"Though we don't talk, I'll miss our conversations"
"I fall apart, you fill up the empty spaces"