Sweet Pure Soul

Izumi is the 7th son of karlheinz, born after the son's of karlheinz was a little over 100 years old, he is kind gentle and heartwarming, feeble as people call him, but also having an independent spirit, besides his background, he refuses to take human blood, anything blood really having the ability to contain his thirst: he is a sweet pure soul but will his brothers taint him? or will he taint them?