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Ryo is an average, but brooding high school student who constantly has nightmares about Dante. When he is spirited away to the Himalayas during a hiking trip, Ryo is manipulated by Dante's demon form to free him, resulting in Dante brutally murdering Ryo.
Ryo is able to overcome Dante's influence and is granted the demon's power. Later his memories restored by Medusa, Ryo finally accepts being Dante and resolves to seek revenge against God for the massacre of Sodom and Gomorrah.
Ryo possesses two forms while transforming into the demon version of Dante. One is the form Dante assumed during God's attack on Sodom and the other is a small human size.

Source- Wiki