I Dreamed of Becoming a Ship Girl, but I Accidentally Became a Siren

Azur Lane! Miya Ya is a human girl who wants to become a ship girl. She fights side by side with the girls of Azur Lane to defeat the enemy - the sirens! However this is impossible! How can a human become a ship girl? "It's not impossible. Why don't you give it a try? Become a ship girl." ——The strange person who appeared in the room that day gave me a ship suit. "Let's call you Special Executor Type I, codenamed Ice Butterfly." In this way, the Siren Executor Type I Ice Butterfly was born. "Siren? Isn't it Azur Lane!?" This is a story that takes place in a special world line, a world line that changes due to the birth of a special human ship girl. Let's call it the τ test site.