Honkai Impact: in the Name of Love and Peace, Save the World

[Honkai Universe + Kamen Rider + Former Civilization + Current Civilization + Parallel World + Make Up for Regrets + Only Sword Protagonist + Multiple Female Protagonists] After accidentally traveling to the Collapse World and seeing the Valkyrie who had always been by his side, Hoshihara Yuu clutched the Soki Drive in her pocket and tried hard to do something. An obsession, a wish. Rewrite the fate of Cecilia and Siren and save the lives of innocent people. Extend Ji Zi's life and save the teacher whom she loves in her heart. Make up for Ying Jie's regrets and connect the past and future of this world. Nip crises in the bud before they happen. Let the tragedy that would have happened never happen again. And, in the process, write your own knightly story. But on the way to the end, the young man discovered that the world in his eyes was not as simple as he imagined. Pandora's box on the table, and the evolutionary drive being assembled by myself. Hoshihara Yuu plays with the black hole trigger in his hand that has not been released from the seal, and the coffee shop he opened that has never had any customers. Looking at Sirin and Bella who were poisoned and fell to the ground after just taking a sip, he couldn't help but have black lines on his face. "What I got should be the War Rabbit script, right?" Outside the Nasita Coffee House, a passing Kamen Rider looked up at the coffee shop's sign. A confused smile appeared on his face, then he turned and walked towards the dimensional wall. "Don't let me down, brother." This is a story about a genius boy from another world who fights for all the good things in the world, just to protect the people he loves.