If you're looking for manga similar to Chrome Shelled Regios (Light Novel), you might like these titles.
The year is 2022, and gamers have lined up on launch day to connect to Sword Art Online, a hotly anticipated MMORPG that allows players to connect to an immersive, lush virtual reality world with special helmets called Nerve Gear. Kirito is eager to return to the place where he spent a good deal of time as a beta tester, and quickly becomes friends with Klein, a newbie player. But soon, Sword Art Online's 10,000 players discover that not only are they unable to logout, the only way they can return to their physical bodies is by beating the 100-level tower's final boss - that is, if their HP doesn't drop to zero first, for death in the game means death in the real world. Now, with no one else to turn to, Kirito and the other participants must survive the game as best they can – some forming guilds, others ruthlessly leaving their peers behind, and many tragically falling by the wayside or to the merciless monsters populating the lands...
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If you are into alternate world novels with lead characters that are into saving the world but on their own way you probably like Sword Art Online as well.
Mysterious flying creatures known as Zai suddenly appear, and in order to fight the creatures, mankind creates fighter aircraft called "Daughters," as well as the automatic fighting mechanism "Anima," which are shaped like human girls. The story centers on a young man named Kei Narutani, who yearns to fly in the sky, and an Anima considered to be humanity's trump card, a girl name Guripen.
In the future, warfare has been revolutionized by the invention of mechanical weapons called “Objects.” These Objects are overwhelmingly powerful, rendering traditional weapons like guns, tanks and fighter jets completely useless. Qwenthur is an un-athletic, but smart soldier who aims to work as an Object mechanic. Stationed at an Alaskan Object base, he meets Milinda, a stoic but beautiful Elite Soldier who pilots her own Object. As they learn to support each other in battle, Qwenthur begins to uncover the grim secret behind the Heavy Objects
The Republic of San Magnolia has long been under attack from the neighboring Giadian Empire's army of unmanned drones known as the Legion. After years of painstaking research, the Republic finally developed autonomous drones of their own, turning the one-sided struggle into a war without casualties-or at least, that's what the government claims. In truth, there is no such thing as a bloodless war. Beyond the fortified walls protecting the eighty-five Republic territories lies the "nonexistent" Eighty-Sixth Sector. The young men and women of this forsaken land are branded the Eighty-Six and, stripped of their humanity, pilot the "unmanned" weapons into battle...
The war on terror exploded, literally, the day Sarajevo was destroyed by a homemade nuclear device. The leading democracies transformed into total surveillance states, and the developing world has drowned under a wave of genocides. The mysterious American John Paul seems to be behind the collapse of the world system, and it's up to intelligence agent Clavis Shepherd to track John Paul across the wreckage of civilizations and to find the true heart of darkness—a genocidal organ.
In a world where corporations snuff out the competition by sending fighter jets to attack their offices, teenage pilot Kannami Yuichi is reassigned to a new base. There, he meets Tokino, a carefree pilot who enjoys the company of older women, and Kasanagi Suito, his superior officer who he slowly falls for. However, not everything is as it seems. Soon, distressing questions are raised about Kannami's predecessor, a race of perpetual adolescents known as the Kildren, and the enemy ace of the skies, Teacher.
Over a century has passed since mankind sought an outlet in space for its burgeoning population. It is now Universal Century 0100. A new battle, one forged from the experiences of Hathaway Noa once embroiled in the Neo Zeon calamity caused by Char Aznable. The Minovsky Craft equipped Xi Gundam dances wildly through azure skies…
The story is set in August of 2026 at the Fuji Training Facility. Natori Touko, a third-year middle school student in the Eastern Private Defense Academy, is entrenched in field training with instructor Kamiya. It has been a harsh training regiment, but it is finally the last day. Kamiya proposes a extracurricular class under the name Newest Weapons Research. But then, an incident occurs that rocks all of Japan.