are you kidding me? ARE YOU KIDDING ME?
As far as I am concerned, Ranka acted completely immature. I've just glossed over the episode but as far as I know hundreds of people died in very horrible ways, incl. mutual friend Michael -gored and sucke out into space-, in the process blowing up an entire ship filled with people's homes, and her reaction is to allow Brera to pound Alto and go away to save her pet Vajra whose cousins just caused all that terrible mess not 24 hours ago? And you blame Alto for his reactions which would be completely normal as an adult? This is perhaps the one time I can agree with an anime character's cardboard reaction of crying out a person's name... in disgust and disbelief, I hope.
Seriosuly, after the deaths of thousands of people and the ensueing destruction, the only reason why one should try to understand Vajra is to figure out the best way to eliminate their asses from space, not to "understand" and live in harmony with those who seem more than willing to come and destroy your homes and kill your freinds and family any time they wish.