Bleach

Kaien Shiba:
[To Rukia Kuchiki] Whenever you fight from this point on, there is one thing that you must never do. And that is to die alone. Our bodies are composed entirely from Reishi. If we die, our bodies will disintegrate and become part of the reishi that makes up Soul Society. And when that time comes, where will your heart go? Your heart will be passed on to your friends. If you pass it on to your friends, then your heart will always live on within them. Kuchiki, that's why you must never, ever, ever die alone.[125]