Matsushita is a Judo expert. He has a well-built body and narrow eyed, which earned him the reputation of being the 'Kuma-san' or Mr. Bear. He is a level '5 dan' in Judo.   ~!It is shown in episode 12 that after several days of training in the mountains Matsushita is no longer overweight.!~

Otonashi wakes up in the afterlife to find out he has no memories of his life before death. Desperate to survive in a war that could yield another unfortunate fate, he joins the SSS in the battle against Angel, whose very mission is to destroy all inhabitants of this afterlife. As Otonashi struggles to recover his memory and learn more about this world, he finds that not all is as it had seemed. 
(Source: Funimation)

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Special 1 - Angel Beats!: Stairway to Heaven 
Operation High Tension Syndrome. Another one of Yuri's plans, this time only so they can meet GOD. 
A special, unaired, episode of Angel Beats! which is included in the 7th volume of the BD/DVD. 
 
Special 2 - Angel Beats!: Hell's Kitchen 
A special, unaired, episode of Angel Beats! which is included in the Blu-ray Box.

Angel Beats! -The Last Operation- will reveal why the Afterlife Battlefront members came into this world.
 
New Angel Beats! manga series serves as the "true arc."
 
(Souce: MangaUpdates)

Kanade Tachibana is a beautiful girl known as "Angel-chan" at school.
She is traveling all over the country in search of "someone."
One day, while staying in Kanagawa, she met Yuri Nakamura, a happy and cheerful girl.
 
Along the way, other people who look like SSS members (?) also appear⁉
Will Angel-chan be able to find that special "someone"…?
 
(Source: ComicWalker, translated)

Godan Matsushita