The ecchi tag is exaggerated anyway. I'm giving it a lower score than it deserves (more in spoiler tag at the end).
The story
Sawamura Seiji is known as Mad dog and is the strongest delinquent in the city. Except for his sister. But he only wants one thing: a girlfriend. After another rejection, he wakes up and to his surprise, a girl is attached to his right hand (getting cr*p past the radar). The girl, Midori, confesses that she always liked him, but was too shy to say it out loud. Midori quite likes the fact, that she is now Seijis hand. He is against it, but will get used to it. The story continues with their everyday lives together.
I wouldn’t say it’s a gag manga, but some chapters were totally random. Not a bad thing at all.
Art
Very good. Above average shounen art. There was not that much of panty shots, which was for the better. But it was forgettable and not very original (the art). Generic shounen.
Characters
For me, characters are the most important thing in every fiction. And here, the characters were great. Sawamura Seiji kind of reminded me of Harima Kenji. He wasn’t that cool though and I also don’t like him that much. He was too kind, seriously. Misunderstood delinquent, who only wants love. I'm not surprised there were so many girls (and boys) in love with him.
I hated Midori though. She was helpless, selfish and… well yeah, she was selfish. She didn’t worry about anyone but herself and Seiji. She didn’t care that there are people worried about her. Also, I don’t like these happy characters.
I have to write about two more characters, because they are my favorites.
Shingyouji Kouta-kun!!! aka how to add shounen-ai to a shounen manga. I don’t even know what I like about Kouta, but the chapters about him were seriously funny. He is a guy that attracts troubles. Or troubles attract him. Anyway, his falling in love with Seiji was hilarious.
But the place for the best character definitely goes to Ayase. Ayase was holding the whole story together. Best chapters were with her (or Kouta). She is such a sweet girl. In school she is the annoying know-it-all, but you can see that the character was very well done. She plays with stuffed animals. Just look at her room, so cute. Her love to Sawamura was so pure and romantic. Really, the most romantic scenes in the manga were with Seiji and Ayase, not Midori. She is strong, kind of irrational (especially the “I saw him first” reasonings), pure hearted and righteous.
Enjoyment
Good and funny manga. I recommend it to everyone. Seriously, go read it. I as a girl liked it, so if you just stay away because its ecchi or shounen, don’t.
So about the low score:
I really hated, that he didn’t choose Ayase. I cried the whole chapter, when she confessed to him. (The second time). Seiji and Midori aren’t such a good couple. It would be a lot better if he chose Ayase, Midori realized that the first love never last and so on… Even Kouta would be better. I know, the story was about Midori, but she just doesn’t deserve him! Poor, poor Ayase. Let me hug you. hug