Kadode Koyama's mother's boyfriend. He plans on marrying her.

The Japan Self-Defense Forces are still looking for a way to combat the alien threat, but so far conventional weapons have had no effect. Maybe it’s time to try something unconventional. 
 
Meanwhile, Kadode Koyama and her best friend avidly track the aliens’ movements on social media and less enthusiastically study for college entrance exams. When the end of the world looms overhead, you learn to take things one step at a time. 
 
(Source: Viz Media) 
 
Notes: 
- Winner of the 66th Shogakukan Manga Award in the general category. 
- Includes 1 extra chapter.

As the world is threatened by the sudden appearance of a mysterious alien mothership, best friends Koyama Kadode and Nakagawa “Ontan” Oran carry on about their high school life. But as they grow up, they face existential questions, learning adulthood’s complexities and that the true threat may not be from above. 
 
(Source: Crunchyroll) 
Note: Includes Episode 0, which chronologically occurs between episodes 16 and 17.

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