It's "Girlie Clothes Magical Boy Battle Flyer ITSUKI"!
He fights hard to defend the harmony of his hometown,
but has no interest in wearing girl clothes!
How embarrassing!

The Game:
Itsuki needs your help!!!
Top level invaders have come to town,
and they've teased him, foiled his plans, assaulted
and penetrated his body.
His fate is in your hands!

Choose boy or girl -
Itsuki's lustful big sister, or his scientist neighbor with a loli complex.

Advise the battle -
Tell Itsuki how to fight to determine whether he wins or loses.

An erotic crossdressing adventure game!

[From DLsite English]