|Seidou High School - No. 12|
|Bats: Right||Throws: Right|
|Nickname||Miya-chan (by Ryousuke)|
Miya-san (by Miyuki
|Age||17 (debut) |
|Date of birth||31 August|
|Place of birth||Saitama Prefecture|
|Height||176 cm (5' 9")|
|Weight||80 kg (176 lbs)|
|Education||Third Year High School (debut)
Seidou Alumnus 
|Manga||Act I - Chapter 30|
|Anime||S1 - Episode 12|
|Voice Actor||Taishi Murata|
|“||I'm not interested in a second-string game.||”|
— Miyauchi to Ryousuke
Miyauchi Keisuke comes from the Saitama prefecture and was a third year student of Seidou_High. He was the reserve catcher of the First-String of the Seidou High School baseball team.
Miyauchi has short black hair with a short tail end behind. He is the only character in the series who snorts out from his nose which means he's either saying something serious, or he's irritated, pumped up or just doing anything that makes him exert effort.
He has a huge build which is attributed to his daily rigorous practice even after training. Miyauchi may look scary but is not as scary as Isashiki.
Miyauchi does not talk much. But when he does, he says the most important things in the shortest way.
He was a member of the "Hopeless Generation" 1st-Year students that entered Seido's team, and by comradery and sheer self-determination they improved themselves to become a team with the potential to make nationals. Miyauchi was thin boy and was advised by his upperclassman to take up bodybuilding so that he could withstand the home plate collisions he would be subject to as a catcher. He took that advice to heart and dedicated himself to bodybuilding and baseball training with his year mates. Although he received playtime on the field during practice games, his primary job during tournament games was as the reserve catcher who made sure relief pitchers were ready to play when needed. Deep inside, he knows Miyuki and Chris are catchers he may not be able to catch up to. However, he's the type of player who strives harder when surrounded by talented guys. Miyauchi, as commended by Chris, is a member with a very strong fighting spirit.
Despite being inferior to Miyuki in terms of baseball skills, he is a dignified player whom the former respects and feels threatened on several occasions after they retired. He acknowledges that in comparison, his abilities as a batter, and to call plays is not equal to his younger teammate's. But Miyauchi is very practical and is determined not to allow that fact to distract him to the point of affecting his performance as a catcher. He also reminded Miyuki of his role as captain who has to look after his pitchers, specifically calling his attention to help Kawakami.
After the summer tournament, Miyauchi still occasionally visits the team and always reminds Miyuki of his tasks as the new captain. He is the 3rd years' official catcher during the 3rd years vs. current members intrasquad game
His sense as a catcher is inferior to Miyuki's, but his catching skills are high. Miyauchi is good at meeting the opponent's runners with a rebuff thanks to his thoroughly tempered body. He trains persistently and in silence.
Towards pitchers, he tries his best to use their potential and known skills. He is especially supportive of Tanba, who had asked his help to develop his forkball. Towards Kawakami, he's a bit peculiar. Miyauchi once grabbed Kawakami's balls to help him regain his confidence.
Miyauchi has little difficulty catching Sawamura's pitches and is also able to catch Furuya's fastballs since he had been catching 150 km/h balls from pitching machines.
Before Miyauchi retired, he was able to participate in some important practice and preliminary games, but little is shown when he's at-bat.
This data is based on the official guidebook, it will only be changed if there is an official update!
You are free to write about the characters improvements in the Skills section above!
- Favorite Food: Sasami, Egg whites 
- Favorite Subject : Science in general 
- He likes unicorn beetles and his hobby is muscle training. 
- He respects Sawamura Hirokazu 
- He is disliked for often grabbing the pitchers nether region as a means to ease their tension. 
- After graduating, he is last seen joining a Mixed Martial Arts gym. 
- "I'm not interested in a second-string game." - to Ryousuke 
- "You've made it this far and there is no relief in sight. But you'll be fine. You've lost some of your velocity but you've pitches all game. Have some confidence!" - to Kawakami 
|Seidou High School|
|Miyuki Kazuya • Maezono Kenta • Kuramochi Yōichi • Kawakami Norifumi • Asou Takeru • Nakata Ataru • Ono Hiroshi • Higasa Shōji • Seki Naomichi • Yamaguchi Ken • Kijima Rei • Kawashima Kengo|
|Sawamura Eijun• Furuya Satoru • Kominato Haruichi • Kanemaru Shinji • Tōjō Hideaki • Kaneda Tadahiro|
|Yui Kaoru • Yūki Masashi • Okumura Kōshū • Mogami Takeshi • Asada Hirofumi • Seto Takuma • Kuki Yōhei
|Former players||Yūki Tetsuya • Tanba Kōichirō • Kominato Ryōsuke • Masuko Tōru • Isashiki Jun • Miyauchi Keisuke • Sakai Ichirō • Kadota Masaaki • Kusunoki Fumiya • Takigawa Chris Yū • Azuma Kiyokuni
|Managers||Fujiwara Takako • Umemoto Sachiko • Natsukawa Yui • Yoshikawa Haruno
|Staff||Kataoka Tesshin • Ochiai Hiromitsu • Takashima Rei • Kazuyoshi Oota|