After Quick Transmigration, I Made an Off-Site Call to Red Robin

In this quick transmigration story, the female lead has a one-sided crush on Tim Drake, the Gotham vigilante Red Robin from DC Comics, who exists in the world on the other end of a phone call.

The unserious blurb:

After countless hardships, you, a terrifying creature with a sanity-draining true form and a not particularly high IQ, finally get your happy ending with your beloved. Then, for some inexplicable reason, you're bound to something calling itself a "System." It insists that if you transmigrate into Mary Sue novel worlds and play the heroine, you can earn points to redeem for high-tech gadgets in its store, or transmigrate to other worlds for a trip.

You want to make your beloved happy, and the offer tempts you.

So one day, Red Robin, AKA your boyfriend, wakes up and instinctively reaches to kiss you, only to find a note with a message on it:

Dear Timmy, by the time you read this, I'll have gone to gather the most incredible technology in the universe for you. I'll get in touch when I can. Don't miss me!

The renowned Gotham detective and vigilante Red Robin is left with an unusually blank mind.

Meanwhile, the sweet and naive System has no idea that the person it bound isn't some fragile young woman, but a terrifying monster who refers to humans as food.

The female lead is a terrifying nonhuman with no morals who eats people. Most humans in the quick transmigration worlds are food to her. She's not very bright, but her husband is, so he takes over the plot whenever they transmigrate into a world.

The Batfamily characterization follows P52, N52, and Wayne Family Adventures. The quick transmigration worlds include American comics, Japanese manga, games, films and TV, and novels.

Theme: Lovers will find their way to each other.