Phantom requiem ending

I finished phantom requiem and I think it was a decent anime. But honestly I didn’t like the ending after everything the Mc dies. I know he got his karma but what about inferno then why didn’t they receive their karma. I also find so many death unnecessary like Liz and cal, because why did cal had that much rage. It’s not like it was the Mc fault that he left her because he thought she was dead she also thought he was dead. They made her character so annoying and why didn’t they make her look so old after only 2 years. Overall I would give this anime a 6 I would give it a 7 if it had a happy ending 😭