Harem

Crossing into the anime world and have a rescue system that will pop out a quest suddenly.
    Can I get items and abilities after completion?
    Do I have to travel to another world?
    But before that Yuuki needs to save the world of otaku? Even though he is a Yakuza?
    Everything start from here.
    (This synopsis looked like the one from my Hitotose Note).
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    Only update, when I have nothing to do
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    Cover not mine, it's from anime Hajime no Gal
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    Grammar sometimes sucks but bear with it.