[Anime Crossover] Can't You Save the World Just Because You Play Tennis?

In an unnamed citadel, there was one thing they always told every new blade: this citadel had two actual masters.

That citadel belonged to Keigo Atobe and Genichiro Sanada.

But they were no ordinary masters.

Some guy from the sky: When it comes to transmigrating through time and space, they have more experience than I do. Wait, no, they're not outside consultants! Chuuya gets terrifying when he's angry!

Some calamity: They're my precious family!

Some Guda: I want to go on another mission with them next time!

Some Demon Slayer Corps member: They're both so kind and so strong.

Pairing: Atobe x Sanada (Keigo Atobe x Genichiro Sanada)

Updated slowly.

Theme: No matter how difficult things get, never choose to give up.