Kuromukuro

The construction of the Kurobe Dam unearthed a mysterious artifact, leading to the establishment of a research facility dedicated to its study. Life for Yukina Shirahane, daughter of the facility's director, is ordinary enough until a sudden, devastating alien invasion shatters her peaceful world. Amidst the chaos, a long-dormant ancient artifact awakens, revealing a samurai from the past who finds himself thrust into a futuristic war he barely understands. Now, this unlikely duo — a modern high schooler and a warrior out of time — must navigate a global conflict against an extraterrestrial threat. As the line between ancient prophecy and advanced technology blurs, they'll discover that humanity's fate might hinge on understanding the secrets buried deep within the Earth, and the true nature of the aliens' relentless assault.

✦ AI-drafted summary