Is love a singular concept in either eastern or in western tradition?
I think not, but I don't read Kanji. However, I've read:
愛 ("ai") = fundamental desire, which may be either selfish
, the later being associated in Buddhism with enlightenment
兼愛 (Chinese -- “jiān'ài”) = universal love
仁 (Ren) = “benevolent love,” associated with Confucianism
Then for you biblical scholars (you know who you are), we have the Greek -- philia, eros, agape, storge, and xenia....
In Medieval Europe arose a peculiar and psychologically kinky concept of courtly love.
And we haven't even gotten to the emotions that may arise in connection with shoji screens....