Enemy might be too strong a word. Maybe more of "not-so friend"? Or even, "former friend"? Sounds interesting, doesn't it?
Anyways, I just read through your comic. The styles are great, it's just that the ever-shifting nature of styles can be confusing for many readers. Maybe try to stick to one style and adjust the shading as the scene calls for it?
Aside from that, the comic's great. Keep up the great work!
Anyways...here's my "slice of life/romance" novel. Do me a favor and punch me a few holes in it, will you? I need the criticism. After all, it's the only indicator that someone's been doing a good job.
Here's the link.
Thanks!
-Helioxiv