Lucy starts to wonder why NATSU is so insensitive to complicated feelings. She finds out that dragon slayers are very seceptible to stress. That made sense although, what else she found out (not actually true) was more interesting. Dragonslayers also cannot cope with stress or depression at a early age , or else they may ignore eavan forget complex emotions. So, what will happen, when Lucy sighns him up for Emotional therapy? He may or may not realize his feelings for her.
3 parts