A Survival Guide to the Otherworld in a Crossover Universe

Kambara Isshiki was just an ordinary corporate drone who stayed up late playing galgames. When he woke up one morning, a "Dimensional Completion App" had appeared on his phone.

Mission: Infiltrate anime worlds corrupted by the hidden world, cleanse the "contamination," and recover broken storylines.

Reward: For every heroine he saves, he gets to draw one of her "spiritual desire skills"... Sounds pretty tempting?

Until he discovers:

Asuka from Evangelion has turned "mental linking" into a plug-suit play session;

Rin Tohsaka uses gem magecraft to force him into a semi-permanent mana-transfer contract;

Fuuma Kotaro of the Anti-Demon Corps treats him like a "portable magic battery";

And most outrageous of all, after the heroines are purified, their affection levels are permanently locked at 100%, but they all awaken their memories of the hidden world. They remember every route through it!

So when the barrier between the surface world and the hidden world finally shatters, tens of thousands of heroines he has romanced descend on reality all at once.

Isshiki stares at the crowd of meat cleavers, tentacles, jeweled swords, and Anti-Demon Corps chains filling his doorway, deep in thought.

"If I say I was only trying to save the world, is it still too late?"

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.