double suicide by mutual consent
Refers to a suicide pact where both parties agree to die together, often in a romantic context. Distinct from forced or murder-suicide situations.
A double suicide by mutual consent is when two people choose death of their own will.
Compound of 合意 (ごうい, 'mutual agreement') and 心中 (しんじゅう, 'double suicide'). The exact historical derivation is uncertain, but the term is used in modern Japanese to specify a consensual suicide pact.