
looks like the series is completed with only one volume so i guess there's an open interpretation for how you can see the friend, though the last couple pages where he is in makes him look like he has some kind of secret.....

SPOILER... kind of
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his friend kind a knows that Souhei likes him and he's suddenly jealous that he's not the guy that is uhhh number 1 to souhei anymore and how someone else knows souhei very intimately. he's thinking like what kind of expressions does souhei have when he uhh have sex or what does he likes. but in the end he accepted how that's how it is and asked souhei if he's happy.
Even after I read the raws I feel tt that friend spells trouble == I’m getting a bad feeling from him.. a really bad feeling.. and I don’t like this feeling one bit ==