I'm not sure if I enjoyed this anime. Plot is kinda interesting, but when you closely look at the mc. Her acts doesn't really make sence. She let the brothers do whatever they want to her without any bigger resisting or fighting. NO RAPE!! or SEXUAL ABUSE!!
The grafics are pretty good. I personally liked the detailes of hair and eyes, which were really elaborate. Oposite are some objects in the house which didn't fit in the plot (If you remember mc's bed for exemple).
Characters looks good, but for second sight you can feel that all brothers act practically same.
I'll take it straight. This anime isn't for everyone. I guess there won't be much men who would say they liked this show. Even girls will propably have diferent opinion, since mc is acting really naive, shy and helpless (NO HATE!).
Aterall I think this anime is average. If you like shoujo anime you should probably like this one too.