Wow... seriously...  I feel like taking back some of the things I said earlier in this manga... 
Hitomi has genuinely ascended to a meganekko...   and become a Best Girl.  
Still not sure whether she or Sayo-chan is better though.  Sayo is a full-time meganekko and has a more relatable personality... but Hitomi's frames are thicker, and she has mad skills...    Tough battle.