Akira Inugami, a new transfer student to the private school, Hakutoku Gakuen, is actually a werewolf with immortal power when the full moon approaches. The intelligence organizations of various countries attack him one after another.
 
(Source: Wikipedia, translated)
 
Notes: 
- This two-volume series is the prototypes for the "'Wolf Guy Series" of novels, especially for the first two novels volumes entitled Ookami no Monshou (狼の紋章) and Ookami no Enka (狼の怨歌).
 
- The series has also been re-adapted with a more violent and mature setting in 2007 by Yoshiaki Tabata and Yuuki Yugo. This new adaptation is known as Wolf Guy - Ookami no Monshou.

Akira lnugami is infected with a terrible poison. The only known antidote has an unfortunate side effect-it turns him into a werewolf. He opts for survival, but then has to cope with his new desires and with the attention of the military, who are interested in using his affliction for their own purposes.
 
(Source: The Anime Encyclopedia)

Akira Inugami just transfered into his new school. The principal and teachers fear what may happen because Inugami was placed in the same homeroom as the school's biggest problem and gang leader. His homeroom teacher Aoshika is going out of her mind trying to figure out what happened the night before, where she could have sworn she saw this same Inugami beaten alive and then hit by a car by a large group of thugs in a park. But somehow, Inugami, who denys everything, of course, is alive and without a scratch attending his first day at his new school. What the teacher Aoshika did not witness was a crazy werewolf-like beast destroy the thugs that attacked Inugami in the park. (Source: MangaTraders)

This is an adaptation of three episodes of the "Adult Wolf Guy" novel series titled "Tsuki to Yoru to Oogami" (月と夜と狼, vol.1), "Oogami wa Shinazu" (狼は死なず, vol.1) and "Jinrou, Akatsuki ni Shisu" (人狼、暁に死す, vol.5).


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