Reincarnated in otome but only as a spirit inside of minor character!

MC died in real world and when he regained his conscious, he's a spirit inside a little boy. After the long talk with the boy, he came to know that the world he got reincarnated was just an otome game that he played in past life. Knowing exact history and future, they planned together to saved kingdom and princess a.k.a female antagonist from her despair. When the boy ask why antagonist, MC answered "because I love her voice actor". I took references from Mobuseka. I love Angelica and I make similar character like her. But this is my original story. Also.....this might be little trashy like the rest of my books.