Rebirth in Haikyuu... Not? (Rewrite)

Endo Akihito, born on January , died at the young age of 18 while stsaving a little girl during a shootout between yakuza.
When he came back to his senses, he found himself in a different body, in a similar yet different world with characters that he recognized from pop culture.

His only hint on how he ended up there when he was supposed to be dead was a letter that he found on his bedside table.

What will Akihito do with this second chance?

Will he be able to enjoy the world he is in?

Will he be able to survive it?

And most important of all... what is that stupid screen he sees all the time?!

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I was heavily inspired by "The Gamer", "Rebirth in KnB" by Fiction (it's here on WN) and my own imagination. This is the culmination of all my previous

Also, this is an AU. This is a complete mix of worlds. Characters from many random series might pop-up whenever I feel like it.

At some point, this will shift into a Zombie apocalypse HoTD style, but with elements of stories like "Moshi Fanren", "God and Devil World", etc.