四し角かく関かん係けい

noun

love quadrangle; four-way relationship

Refers to a romantic or interpersonal configuration involving four people, often with overlapping affections, analogous to a love triangle but with four participants.

• あのドラマは四し角かく関かん係けいが複ふく雑ざつすぎて、誰だれが誰だれを好すきなのかわからなくなる。

  That drama has such a complicated love quadrangle that I lose track of who likes whom.