Teppen! is about a girl Kobato who came to Japan to look for her brother, whom she only found out about recently due to her mother's death. While walking around Japan, she meets Takeru and there the story begins. Takeru mistook him for a participant of an audition that was being hosted nearby, therefore he was dragged there and amazingly, he was accepted. He then becomes a trainee then Takeru's partner in the business.
I'd just like to say that I was led to think that the story would be more about her looking for her brother than her love story with Takeru. Although, I should add that for some time,she had a suspicion that Takeru was her brother. Aside from that, she didn't really make an effort to find him although she always mentioned that it was her goal and her reason to be staying in Japan.
The art was your typical shoujo manga art. Not saying it was bad, but it's really typical. I can't see differences between its art and others mangaka's art but most of them are like that anyway..
The plot wasn't all that great either. It's always a parent dying, either telling you to look for your dad, mom, long lost brother or sister. Very typical, again. Another typical thing is liking someone who you suspect later is your sibling. So, no originality points there.
Although to me, it was very cliche and really nothing special, I still think it's a short and sweet read.