Ketsuekigata-kun! 2 is slightly better than S1 in my opinion and vastly superior to the dreadful special. But still less than average. For me what it all boils down to however is its a comedy and I didn't find it funny due to the cultural translation. And if you remove the humor nothing much happens. Now I'm not trying to scare you off if you liked the first season I definitely say you should watch s2 as well cause its a improvement on s1. plus the whole season is only 24 minutes of your time so even if its sub par its over and done with in notime at all.