What is this 'Dimensional Chat' ?

My name is Satria Akbar.

I'm just an ordinary man in college with a part-time job, but when I see a kid who almost got crashed into by a truck, I save her, and the result? Yes, I am dying.

I think my life is finally over, but somehow I was reborn in an unknown world with a new identity as Shidou Matsumi, a normal teenager with a normal family.

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What the hell is this 'Dimensional Chat"?