Red Data Planet

The morning after a meteor fell in Japan, a mysterious beautiful transfer student Monika appears in front of Leo Kuroishi, an ordinary high school student. But the moment she told him "I will protect you," Leo's problem-free days changed forever. What is the value of life? The fate of humanity? A new disaster action manga begins!

(Source: Akita Shoten, translated)

Note: Includes 1 extra chapter.