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I don't know about partner. There is a Japanese high-school tradition where a Junior will try to get the top blazer button of a graduating Upperclassman they admire. Usually a girl trying to get a guys... but not always. Off the top of my head, I have seen it enacted or referred to in Lucky Star, Hidamari Sketch, To Aru Kagaku no Railgun, Sasemeki Koto, Minami-ki, Maria Holic (which is one of the funniest series Ive ever seen)I think Kaoru actually tried to get Minamoto's when he was regressed in age in Zettai Karen Children.
A lot of instances. Don't know what it's called.
Per Aspera Ad Astra To the stars by hard ways*

Is there already a trope for the shoujo relationship thing/cliche where the person gives/exchanges their uniform button with their partner? I remember from Shinshi Doumei Cross where they traded their uniform necktie/bowtie instead and was wondering if there were other versions.
Edited by Jasminerva