If you liked the Lesson XX anime, the Anime-Planet community thinks you'd like:
One dark and stormy night, Hiroki Imanishi lept in front of a car, saving one young girl's life -- and ending his own. Upon leaving his body, Hiroki discovered that he was not alone, being joined by Fhalhei the evil spirit, a being that loves Hiroki and wants him for her own. What's worse is that Hiroki's body seems to be inhabited by a new spirit! Can the real Hiroki and his companion Kanata Tokino get to the bottom of this mystery before Hiroki loses his life for good?
Cute shounen-ai fluff is at the heart of Lesson XX and Ryokunohara Labyrinth. Both focus on the growing relationship between two boys, Lesson XX taking more into account a romantic approach while Ryokunohara Labyrinth leaves the precise nature of the relationship to the imagination of the viewer. Lesson XX is a slice of life production through and through with some angst, Ryokunohara Labyrinth has a fantasy element and some disorientating moments.
When nobleman and gypsy-born Serge Batouille arrived at Laconblade Academy, he had no idea his life would change forever. Upon arriving, he is roomed with the sexually-voracious and flirtatious Gilbert Cocteau, which ensures that life at the prestigious school will dole out more complications and confrontations than either boy has dealt with in the past. Together, these two young men brave love, growth, and the pain of youth, all while growing closer together than anyone would have thought...
Shounen-ai romance with rather old fashion character designs ensures a firm kinship between these two titles. Both deal with coming to terms with same gender affection. Song is considerably darker and extremely heavy on melodrama to the point of being painful to watch, while Lesson XX is more focused on the romantic aspect; but they are both prime examples of old yaoi and probably share the same fan base.