Wow! The slice of life chapters are really good and the character development is really good. I love it. I hope he explore more of his power and use it to study advance things... Like he can play a video at 1.50x speed and use his power to slow time... etc etc... [img=recommend]
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LIKEI haven't caught up to the latest chapters yet so I don't know if there is a limitation of duration in which he can activate his powers if he doesn't have then he could slow down time and do his exercise and that way he gets to spend more time with others. Also he can explore his powers to work like domain or something so that he can specify an area in which he can accelerate or decelerate time that would give him a lot of room to grow. Also I would like to know that does he age when he slows the time or not? That's all I can think of right now, if I have any other ideas I'll write it here.
Also what if somebody else pulls his ear then he/she can also experience the change in time flow with mc.
He doesn't age slow or fast. If fifteen years passes in real world then he'll only get 15 years older.