After that there are a few more likable episodes and then you watch because you want something to happen. This something never really happens throughout the whole series. You start watching to see when the main character finally "mans up", and believe me you'll be very disappointed with the story.
The ending was twisted and demented, the very end of the last episode you think oh I see but really no just more disappointment.
The opening movie clip is by far an exaggeration and should be something else because it brings you into a sense of happiness and oh this is going to be a great anime but in reality its not.
If you want a nice heartfelt story, try not to watch you find it with this anime.
If you want a nice perverted anime, try not to watch you'll just be disgusted.
If you want to cut you wrists after watching this anime, watch and you probably will.
