Story: 4/10. Well, i didn't really get the story but i enjoyed it...
Art: 8/10. I loved how the characters glow in the animation. and the style was artistic and artificial.
Sound: 9/10. everything was fine. it just reminds me of a hentai in the 2000.
Characters: 6/10. In the first episode, Natsuki (Blue-haired, light-skin girl) was shown but episodes 2 & 3 were weird because i first watched this is April but i felt like "I never heard her talk before".
I thought Mikuru (Pink-haired girl) was betraying the nurses and Yosuke (Black-haired young man). But until Episode 3, she helped the characters (NOT THE OLD MEN).
nurse) was OK.
Eri (Green-haired girl) is a good looking character with a rich family. I loved her.
Yosuke was a strong character in this hentai. i saw his desires but its ok.
Haruka (Orange-haired girl) is an another STRONG character in this hentai. i love her.
The old men (Aida, Tomii and Kiba) were the old men with nice designs but creepy a** characters. They only USED the characters for sound experiment so that they can do it with each other and if they escaped, they would die (NOT THE OLD MEN). They were just... ANNOYING.
Enjoyment: 7/10. The orgasms were good.
Overall: 7/10. no need for perverted old men in a hentai. he he he.