If you like reverse harem shoujos, this is pretty much what you need to be watching. I'm one of those people, so I really liked it although not so much at the beginning.
The story episodes kind of drag on in a slow fashion in the start and doesn't really make sense for the first half of the show, you will probably start predicting and making assumptions (like I did). Character development isn't all that good, and I wished they described more on each guy and what they do usually, school clubs but I guess they could only fit in so much about each character (because there's 5 guys) in the show. You only learn a bit about each boy, but you learn the most about Ukyou. Near the ending of the show though, it becomes more clear what's going on and the story line.
I didn't like how the main character was so slow. I understand that shoujo girls are usually soft and quiet and then guys like her, but this was just bad. She took an irregular amount of time to respond in a slow, quiet whisper. If she had been a little more outgoing, the story would most likely have been more fast-paced and you'd get to know the guys better instead of waiting for the Heroine to respond. Although this may be because she has amnesia and she's just being uncertain to what's around her, when people that you think you know are telling you things, don't go easily listening to whatever they say. She's very gullible and naive, and doesn't seem to have a sense of danger until it's right in front of her (literally).
It's nice to see how the guys react around her, what they tell her and what they do for her. It nicely portrayed how much they liked her, especially with Toma and Ukyou. The art is really nice (I don't understand why all the guys sleep with their day clothes on) and their eyes are so cool.
The end of the show was a nice ending, with everything resolved and it ending in a cliffhanger for you to choose what happened. It's wasn't so sad as to cry, though (and I would know because I cry in everything I read, watch or hear about that pulls at my heart strings). I would love to have seen the answer, but then again, I wouldn't know my answer either if I had to choose.
Overall, I thought this was a decent show. It had a reverse harem, cliched romance, attractive guys and most importantly, how much work a guy went through because he liked you so much.