[Kaguya]

living spell - exactly what it says

echos - people who have quite liturally been experimented on and trained get free of their 'normal' lives (could have alot of twists and turns)

summoning - a holy place is getting ready for their deitys arrival, but what really lurks beneath the surface

virus - a virus has wiped out technology sending the modern realm back into the dark ages, what is unknown is what other damages have been done to the realm

merging - beings of a magical/modern realm find themselves in a count realm, what they don't realize is their preasence has started a chain reaction that could destroy both