Getting along with 気が合う

考(かんが)え方(かた)や感(かん)じ方(かた)が通(つう)じ合(あ)う。

The way of thinking and feeling is understood by each other.

Goo Dictionary

気(き)が合(う)う means to get along with someone. Your 気 (spirit) does the action of 合う (to match). When your 気 matches someone else’s 気, the two of you get along. You are kindred spirits.

Examples

Kindred spirits in golf with 気が合う

俺物語!! » Volume 3 » Page 170