Love Prism is a very graphic, single-volume manga. The main purpose of the work seemed purely to show off graphic sex between the two main characters. There's very little that can be said about it.
This manga has very little in the way of explicit guy-on-guy sex. Characters are quickly introduced, and without further ado, the uke's being screwed like crazy by the seme. There is virtually no plot. The level of detail in the drawings somewhat compensates for the lack of substance, but I can imagine most people would be irked at what this has to offer.
Overall, Love Prism is a hardcore smut-fest for hardcore
yaoi fans. Unless you love explicit yaoi, avoid.