If you're looking for manga similar to Ilegenes: Giyoku no Koukyoukyoku, you might like these titles.
Satoshi and a group of his friends are on a lengthy boat ride to Kijijima when the world comes to an end – literally. A huge Tsunami wave 500 meters tall overpowers the boat and he finds himself stranded on an island and alone. Meanwhile the rest of the boat has grounded after being dashed upon the shores and soon Satoshi finds them, and sets off a struggle to survive for the passengers and crew of the ship…
At Academy Island, everything is settled through "Games" waged for a certain number of stars, with the strongest student being granted the ranking of Seven Stars. Hiroto, a transfer student, unexpectedly beats the strongest empress and becomes the pseudo-strongest in the school! A mind game of lies and bluffs begins!
Five students, 3 women and 2 men, was ashore a remote island, survivors of their sudden ship sinking. Finding themselves in this extreme state instinct and conscience intersect and collide! Crossing thoughts, feelings of love and hate mixed with trust and betrayal. A story of uncontrollable libido and murderous intent...
On Kabuchi-jima, an island ruled by Princess Kaguya, ten children were raised as sacrificial victims. Several of the children thought they had escaped their fate when they escaped the island. But nearly a decade later, the kids are still dying in the order and at the time they would have as sacrifices... Their only hope now is to reunite and return to the island to seek out and destroy the source--the legend, the blood-lusting Moon Princess--before time runs out.
In the city Asterisk consisting of six schools, there exists a battle called the Star Wars Festival. Since the winner of the Star Wars Festival will have their wish granted, students strive to train day and night. Main character Wakamiya Minato, the weakest fighter with a 49 consecutive losing streak, continues to fight for a dream.
In a world dominated by the ultimate family corporation, a man arrives by unusual means in the worst part of the worst city in the world: Tokyo Darkside. His origin is uncertain, his powers unknown, and his motivations obscure. We know only that his purpose is ‘renewal’. Of what? Or whom? This complex and highly symbolic movie will appeal to any who enjoys trying puzzle understanding from fragments. The fights are spectacular, and it does make sense… eventually.
At the end of the 23rd Century, a girl stares at a red star in the sky. Her name happens to be Red Star, born on Mars. The series tells of Red's adventures at the center of the Milky Way