My best advice would be flash save editing, which will basically allow you to have unlimited everything and is not very difficult. Use .minerva free online or download the program (both are easy to use and I use the online version myself). Then, select Open in .minerva and tell it where to locate your Flash save, which is generally located in C:\Users\*USER*\AppData\Roaming\Macromedia\Flash Player\#SharedObjects\ and replace *USER* with your username. Your save may be a few more folders deep, but it is usually a linear path. Minerva is easy to use, and nearly everything in the game can be edited and changed from this program (unlimited energy and items, relationship values, money, etc.). This is also great for getting Tomoko & Kotomi info without asking questions 100 times and having to reload to avoid losing energy.
In Minerva, "hp" is your energy level, so:
1. You can use energy in game and get to 0. Save game.
2. I use Flash debug program, so I have to close this out for save file to refresh.
3. Open save in Minerva.
4. Change "hp" to 100. Save file and cut/paste the file downloaded to your flash game save folder above.
5. Open game. Rinse & repeat as necessary.
The closest in-game advice I can give for unlimited energy is from the guide in this thread: "From day 64 forward, there is a chance for you to meet Karin at the Slums (enter and exit the slums repeatedly until she's there). Once you spot her, she will restore your energy back to 100En no matter what it was before. YOU CAN DO IT AS MANY TIMES AS YOU LIKE!". Not sure if anyone has any other ideas, but I personally love using the save editor as it is a breeze.
