One of Mutta's fellow applicants in the astronaut program, whom he befriended 10 minutes after finding out they are the same age. He often cheers Mutta up.
Dedicated, calm and supportive, he resides with his wife and daughter. He's almost always in formal attire and with a smile on his face.

~!He met his wife while in college; they had many adventures around the world before settling down. Their daughter is his main inspiration in life.
He used to work in a "little corner of a big facility" but quickly jumped at the chance of becoming an astronaut in order to escape from there.
Some time after the start of the program, he and his wife had another daughter.!~

Mutta's life has hit rock bottom. He's been fired, blackballed from his profession and now he's had to move back in with his parents. Meanwhile, his kid brother Hibito has been literally riding a rocket and training to be an astronaut. The same career Mutta once dreamed of. So, is it ever too late to go after your dreams? Through a little coercing and a bit of covert activity, Mutta's family and friends can get his resume on the right desk, but from that point on it will be up to Mutta himself. Does he have what it takes to turn his life around and put his footprint on the moon? The first step on the highway to the stars is always the hardest, and in a job where crash and burn isn't just a euphemism, it will be the biggest risk Mutta's ever taken. But with the best support team ever, maybe he'll find what he needs to rekindle the spark inside him and light the biggest candle of them all! 
(Source: Sentai Filmworks)

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Two brothers looked to the starry skies as children and made a promise ... Now, in the year 2025, the younger brother, Hibito, is carrying his out. He is an astronaut who has been selected as a crew member for mankind’s first long-term base on the moon. Meanwhile, the older brother, Mutta, has just been fired from his job and is unemployed, but decides to trust himself just one last time. A text message from Hibito sends him applying to be an astronaut too and shooting for the stars …
 (Source: Kodansha USA)
 
Notes: 
- Nominated for the 2nd and 3rd Manga Taisho Award 
- Won the 56th Shogakukan Manga Award 
- Won the 35th Kodansha Manga Award in the General Category.

Kenji Makabe