I get why you'd feel that way, but it still meets the criteria to be considered a harem title. In that route you're referring to, Lisa actually ends up being a great thing for their relationship, just as close to Haley as to the MC.
On an unrelated note, the version I just downloaded from the Nopy link does not appear to be prepatched.
Haley is referred to as the MC's friend. I didn't apply any patches/mods to it or anything like that. If I'm the only one with this problem, I have... no idea how that happened...