For some reason, he was invited to another world after he rolled the gacha like he usually does. 
The gacha from the social game is available in his trusted smartphone. 
It was a convenient and cheat tool that can give out equipment and beautiful girl characters. 
He now aims to create the world's strongest army of beautiful girls in another world.

Serialisation of the original Syosetu publication 
For some reason, he was invited to another world after he rolled the gacha like he usually does. 
The gacha from the social game is available in his trusted smartphone. 
It was a convenient and cheat tool that can give out equipment and beautiful girl characters. 
He now aims to create the world's strongest army of beautiful girls in another world.

Ready for an adventure that's out of this world? We've gacha covered.
 
Norl's a cutting-edge cutie with a cutting edge who's a cut above the rest. Heihachi's just your average mobile game addict with a whale-sized hole in his wallet.
 
But one day, he pulls an item that pulls him into another world, spinning his life around with a spin of the gacha.
 
Attacked by monsters, and left without options, Heihachi does what he knows best—roll gacha! To his surprise, he watches his unit materialize before his eyes. Heihachi's used to seeing cute girls pop up on his phone, but he's never seen one pop out of his phone!
 
(Source: Kaiten Books)

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