心中
<i>Shinju</i> refers to any [[suicide]] of two or more individuals who are "bound by love".

There was a belief stemming from Edo teachings that [[couple|lovers]] who comitted double suicide would be united in the afterlife.

The word is formed from 心 (heart/mind) and 中 (center/inside). As such, its literal definition could be the "oneness of hearts".
double suicide