Ren'ai Koufukuron

From DMP:
As the son of a prominent and wealthy family, Yutaka wears the mask of a genteel elite student. Frustrated by this facade he must put up and stifled by a future already laid out of him, the only way Yutaka can find to deal with the boredom and unhappiness of his empty life is through sexual release. Then one day, Tohno, a delinquent-looking student with blonde-dyed hair, suddenly transfers into Yutaka's class. As Yutaka finds himself more and more obsessed with a deep abiding lust for this young man, his daily descents into sexual fantasy begin to interfere with his life, until the ferocious impulse to possess Tohno for his own leads him to a diabolical scheme.