Hogyoku Ex Machina is a completed Bleach fanfiction by Mac Ceallach. In the final battle, Ichigo and Aizen strike fatal blows against each other at the same time. The Hogyoku reacts by sending them both back three months to the point in time when Aizen first picked up the stone right after he betrayed Soul Society. On one hand, Ichigo has the chance to kill Aizen properly and undo damage and deaths caused the first time around. Unfortunately, the enemy too is well-aware of what has (and will) happen as well as who they should attack if they want to hurt Ichigo in the worst way.