[Zen-Zero] Ellen 2-hour endurance MIX BGM [Study/work BGM] 

This is Zenzero's MIX BGM. I made it because I wanted to listen to it while working.
This time, I'm making it with Eren as the theme, but I would like to make other characters in the future if there is a demand.
Please like, subscribe, and comment, it will motivate me.
■Reference site
・ • エレンエピソード「お願いエレン様！」 | ゼ...
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