Japanese Plot Maker 2012 ver.C

[Name] was an average teenage male living his average beta school life until
all of the sudden he got sorrounded by a ton of girls who all happened to have
fallen in love with him for no apparent reason and now he's being dragged into
mysterious action packed dramatic clashes of power between numerous characters
he never met before and does nothing about it other than following random orders
and his gut feeling which usually tells him something like "just be beta".
What will happen?

The girl profiles are:

Typical Tsundere: loves the guy but won't admit it in front of him.
Typical Double-D: has absolutely no personality traits. a walking boob display.
Typical Loli: behaves like a little kid and looks like one too.
Typical "childhood friend": passive and unimportant but somehow always there.
Typical Maid: wears maid clothes. No real reason. Well it's a maid after all.

Surprisingly, the story also has guys:

Typical best friend: acts like a complete idiot, very nosy, always cheerful.
Typical main villain: because if there are guys, the villain is a guy.
Typical shop owner: owns a shop, and apparently sells stuff once in a blue moon.
Typical trap: draw a girl, say it's a guy. done. character sheet complete.

The plot goes like this:

Main guy does his unimportant average boring life thing. Sometimes his best
guy friend and childhood female friend show up to remind him he's not alone in
being boring and unimportant.
All of the sudden fate leads him to meet a hot chick who already knows him and
needs him for, whatever. And then she forcefully drags him into some series of
events that apparently all revolves around that guy even though he never knew
anything about that till that point he got dragged in.
Guy stays beta.
More girls show up and join his party.
Guy stays beta.
Flashback scene where apparently the guy was already related to all that shit
in the past but he totally forgot.
Everybody fight together.
It looks like they won't win. But then they do.
Main villain defeated.
Harem complete.
Guy stays beta.
THE END.

Themes to go with the show:

Ninjas
Mechas
Magical girl
Gunfights
Super hidden powers
Cat eats
Maids
Monsters
Random gore (but all blood is censored)