Manga Story

What i was thinking for my story was that after reaching the age of 8 you get to find your power called "renx". Renx allows you to summon a weapon your weapon could be anything even another human, the Renx is different for everyone. But not everyone can have a Renx, theres a 50% chance that you get one abd 50% chance that you dont. Renx helps you fight monsters called Olyn creatures. The Olyns taken over most of the world but brave humans created strong fortresses in some countries. There is multiple factions formed with only Renx users, The Sacred, The Fallen, The Shattered, The Lost, The Union. The Union is the main faction that controls all the other's. The Sacred focuses on fighting the Olyn, The Fallen focuses on protecting the Fortresses, The shattered focuses on healing the injured, The Lost scout areas near the Fortresses to make sure they're are no Olyns approaching, and The Union gives orders to every faction. Each year The Union gives a test to those who want to join one of the factions very few get selected each year, only about 450 people get chosen and then each faction gets to choose 90 people depending on that they're useful for.Lets make our main character have 2 Renx 1 human like Renx and a weapon that looks like a cross that serves as a sword and a gun.The summoned human has their own personality and they follow your orders. I want to makes this like a boys love genre too the main character somehow falls in love with a guy from a different faction