I've only read first few chapters of the manga. It's about a girl and her love relationship with 2 cousins who are quite different in personality. Ichi (played by Arron) is the quiet type and cool type, while Daiya is the friendly playful type.
This is the manga the series adapted from.
http://en.wikipedia.org/wiki/Parfait_Tic!
Character description of the 3 leads of the manga in wikipedia. Throughout the development of the series, the producer and actors has been in contact with the writer of the manga. The author are also satisfied with the choice of cast especially Arron (he does look like Ichi). So, I guess the series should be quite faithful to the manga. But the script need to be rewritten a bit because of the change of filming location due to the typhoon.
click to show/hide spoilersFuuko Kameyama
Is the upbeat main character. She likes playing with little children and hairstyling. Wears her own hair in unusual and complicated styles. She does feel insecure about her looks, especially when being compared to Daiya and Ichi. Had to take swimming lessons from Ichi in order to pass P.E.
At the beginning, Fuuko had a big crush on Daiya but when she confessed he rejected her kindly. Ichi helped her to mend her inner wounds and she fell genuinely in love with him, but at the same time, Daiya was falling in love with her. Although Ichi loved Fuuko, he loved Iori very much too so he dumped Fuuko. Daiya took this as a chance to go out with Fuuko. Fuuko appears to have reconnected with her feelings for Daiya, but it is not known whether she is still in love with Ichi.
Ichi Shinpo
The cold and quiet love interest. Class President and ranks first on school tests, but rather shy and comes across as a haughty guy. Actually very caring once you get to know him. Works part-time in a restaurant. Not good at household chores. Really bad at drawing. Scared of dogs and haunted houses. He is very quiet but seems to be different when near or around Fuuko.
Fuuko had been in love with Ichi, but she ended things with him because of his inability to let go of his feelings for Iori. Although he is still in love with Fuuko, she is now dating Daiya. However, he seems to be open to the idea of tearing the two apart.
Daiya Shinpo
A happy-go-lucky playboy. Not very academic, but wins everyone's heart with his open character. Used to date many girls at the same time, but stopped doing that after he had to reject Fuuko. Sometimes gives surprise performances as a singer in a two-man band, "The F brothers" with Issochi.
He has been dating Fuuko after finally gaining her feelings back for him, but he is insecure about the relationship because he knows that Ichi is still in love with Fuuko and that Fuuko once really loved Ichi,