This is a question I've been considering for quite some time. After all, the storyline is coming closer to the commencement of a second-grade simulation.

I considered using 'Shadow Fight 2' at first, but after some study, I discovered that the sequel to 'Shadow Fight 2' makes the entire verse much more powerful than before, especially with the introduction of Shadow Mind and Accelerator Core.

While my second pick was 'Fullmetal Alchemist: Brotherhood,' the presence of 'Truth' simply breaks up the simulation system's laws. (If you forgot, "The Second Order Simulation represents that the world's maximum battle power is at the Second Order level.")

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While many have suggested 'One Punch Man' and 'One Piece,' I believe that those two animes could be utilised in the future. They also have overpowering characters who have deviated from the second order and have attained quite a high power level (which will be revealed in the future), and these two also violate the rules that I have set for the simulation system.

So, in the end, I'm thinking about utilizing 'Attack on Titan' as the new simulation world. Please leave a comment if you have any ideas.