Ok, so I just played this intro.
You are definitely the bully. One of the nerds does in fact have a girlfriend (Shocked I say!). You, the bully, will be stealing the love spray in Chapter 1. Then come the profits.
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I don't really think this deserves a [Netorare] tag either. Unless we are going so far as to say that the nerds' imaginations of fucking the bully's mom (it does show a few images of what they WANT to do to her but won't ever get the chance) is somehow causing the bully to feel jealous of their thoughts.