https://www.deviantart.com/johnwithlenon/art/LegToe-IK-Generator-Plug-in-for-PmxEditor-928525434
A simple plug-in to create Leg IK bones and Toe IK bones automatically. It does the steps of HarukaSakurai's tutorial on DeviantArt.
How to use: https://www.youtube.com/watch?v=BXCVogM0y-k