losing one's reason due to love; love-induced blindness
Describes a state where romantic passion clouds judgment, leading to irrational behavior or poor decisions.
Falling into the darkness of love, he became unable to focus on his work.
As the saying goes, love is blind; she had lost sight of everything around her.
A compound of 恋 (love) and 闇 (darkness), literally 'the darkness of love.' The expression figuratively refers to the mental blindness or loss of reason caused by intense romantic feelings.