@FluffyCow: It was never confirmed either way, so based on his crazy fanatical cultist rhetorics, the comment above is how I interpreted the situation, since that would fit his established character a bit more than the other way. The case he carried around is indeed for the heart, but I think he did have the heart implanted, the case is there with the intention for Chisato to keep the heart safe from damage after he'd have her extracted it from him, until she could arrange a surgery.