Lillies... Teenage girls that have the power to take down the HUGE, a monstrous group of creatures that showed up out of nowhere, trying to snuff out humanity. Now with this only girls are able to have the ability to use Magic. But soon they hear of a new legend that sparks up in America. "GreyHaven." Assault Lily is owned by its retrospective companies. All music is not mine either

50 years ago, humanity faces a relentless onslaught from enigmatic creatures known as Huge. To counter this existential threat, the world has developed a powerful weapon known as CHARM (Counter Huge Arms), which proves most effective in the hands of young women. These brave individuals, called Lilies, are trained at military academies known as Gardens, where they become the last line of defense against the Huge. Amidst the ongoing struggle, a startling anomaly disrupts the norm: a boy appears, wielding a CHARM with abilities unlike any seen before. This unforeseen presence challenges the established order and raises questions that none can answer. As the Gardens grapple with this unexpected development, the world watches with bated breath. Dive into a tale of mystery and conflict where the boundaries of science, magic, and destiny intertwine, and discover the secrets behind the arrival of the first male Lily. (I will include the game's main story as well as events storylines into the story. Of course, I will not 100% follow the storylines. Some changes will be made.)

A boy named Riyu Isaki appears and claims to be the only male Lily. Although he protects the Lilies, no one knows his origins. Who he really is.

In the near future, humanity faces imminent destruction from mysterious creatures known as Huge. The world wages war against the Huge, and develops the anti-weapon CHARM (Counter Huge Arms) by combining science and magic. CHARMs work most effectively when used by teenage girls, and those who use the weapons are revered as "Lilies." The Lilies are trained at military academies called Gardens, which also serve as bases to protect and guide people. since the user Charms was teenage girl.... what would happen when there, an only one male student, managed to become a Lilies? this story followed by our protagonist, Yuito Inoue, who now is the only male Lilies to ever exist and need to be student on GARDENS school called Yurigaoka. but there only one problem, he is ONLY male student, so how his life will be in this chaotic situation? let's find out.