Talk about boring. Extra Heavy Syrup is a short, mission-based series about two girls who are looking for clues about their ex boyfriend while trying to 'clean' what's needed. It could have been an interesting story but at only 2 chapters is far too short to get into. Not to mention nothing is resolved with the girls! I can liken EHS barely to something like Rose Hip Zero, but the manga reminded me more of anime such as Get Backers.
Overall, I'd suggest avoiding this one.