The love story between Iason and Riki is movingly perfect, a union of love and pain, power and weakness, will and need, hurt and care they're constantly denying their love for each other (Riki does more than Iason, who clearly admits Riki's not just a pet to him anymore), hiding it behind a convenient sexual relationship (which is part of the whole game, but there's more behind it). I have to admit that I already loved Iason before he even apparead in the anime, but while watching, my love for him only increased there were some moments I felt slightly disappointed with him, but those feeling were soon wiped away by his adorable behaviour.
At first I was unsure about whether to choose the old or the new version, but then I just went with the first one, and I have to say it was a wise decision even though the design and the animation are pretty old, and you can see that by the drawings and everything, it was very great no matter what, and probably it was even better just because the characters where the way they were. I had been wanting to watch this anime in forever, but only managed to a few weeks ago I watched the old version, but I'm probably watching the new version too.