Diamond no Ace Wiki
Maimon West High vs. Seidou High
Score 0-17
Winner Seidou High
Manga Chapter 63-67
Anime Episode 22-23
Tournament West Tokyo Tournament

The Maimon West High vs. Seidou High is a high school baseball match, held during the 89th National High School Baseball Championship qualifiers.

Starting Members[]

  • 1st - Kuramochi Youichi
  • 2nd - Kominato Ryousuke
  • 3rd - Isashiki Jun
  • 4th - Yuuki Tetsuya
  • 5th - Masuko Tooru
  • 6th - Miyuki Kazuya
  • 7th - Shirasu Kenjirou
  • 8th - Sakai Ichirou
  • 9th - Furuya Satoru

  • 1st -
  • 2nd -
  • 3rd -
  • 4th -
  • 5th -
  • 6th -
  • 7th -
  • 8th -
  • 9th -


Inning 1 2 3 4 5 6 7 8 9 Total
Maimon West High 0 0 0 0 0 - - - - 0
Seidou High 0 3 7 5 2 - - - - 17

Summary of the Game[]

Ryosuke's liner to third.

Seidou High faces off against Maimon High in the second round of the West Tokyo qualifiers. Maimon’s not playing their southpaw pitcher[1] just yet, but they do have a submarine pitcher[2] on the mound. Kuramochi stands on the batter's box, noticing that the pitcher's form is lower than Kawakami, the pitches come up then down, plus the lack of speed of the pitch make it difficult to hit. After a couple more throws, Kuramochi barely makes contact and is out on first. Next at bat is Ryosuke who is instructed by Kataoka to focus on the easy pitches. He hits a liner to third, while Isashiki is out on a fly to right center field.

It's Seidou's turn to defend with Furuya as the starting pitcher. Maimon's coach, Chiba feels like they are being underestimated while the audience wonder where Tanba is. Chiba signs the first batter to not swing unless it's a meatball. But Furuya’s throwing high and the batter’s swinging anyway. It's a 1-2-3 inning[3] for Seidou.

Yuuki up at bat.

Seidou's captain, Yuuki, is first up at bat to start the second inning and the opponents move to the right side. The short stop is right on second and the second baseman is next to the first baseman. Kataoka tells his players to observe Yuuki's batting. Yuuki hits low but strong, and the speed of the ball make it slip into the outerfield. The fifth batter, Masuko, hits it between infielders and makes it to first while Yuuki advances to third. Now Miyuki’s up with batters in scoring position. The ball is low and in the center, but Miyuki hits through first and second. Masuko advances to third, Miyuki to second, while Yuuki scores.[4]

At bat next is Shirasu. Masuko’s already running home on a bunt on the first pitch and makes it home. The eighth batter hits a fly to the outfield and Miyuki also scores. Sawamura is impressed with the batters' performance and decides to not stay still, asking Haruichi to play catch. Kawakami is told to be ready at any time, but Kataoka calls Sawamura to pitch the next inning.

Official game debut.

After three innings, Furuya is out and Sawamura's on the mound.[5] At Maimon's side, the batter Hasunuma tells his teammates that if they lose this game it'll be their last. He stands on the batter's box and coach Chiba tells him to be aggressive, putting his entire three years on the line.

For Sawamura's first pitch, the ball goes straight into the batter’s back. The infielders gather on the mound with Kuramochi landing a kick on Sawamura. Sawamura’s tense and everyone makes sure he knows it. Now that Maimon have a man on base, the next batter’s trying a bunt. The bunt goes straight to Sawamura and he throws it to short stop for the first out, then Kuramochi throws to the first baseman's mitt for a double play. Sawamura is overjoyed and he roars. The rest of the game goes favorably for Seidou, as the Maimon players are flustered and give up 12 runs in four innings.

Pinch Hitter

At the top of the fifth, one out, runners on second and third, Maimon's ace is now pitching and Haruichi aggressively hit the first pitch. The bottom of the inning comes along and Kawakami puts it away for Seidou. At the lineup, Sawamura is surprised to see the Maimon players cry. He is congratulated by one of Maimon's players and realizes that their team also aimed for Koshien. He shouts to the Maimon's players that he'll do his best and play for them as well.[6]


  1. A southpaw is a left handed pitcher.
  2. A submarine/sidearm pitch is one in which the ball is released underhand, and often just above the ground.
  3. A 1-2-3 inning, also known as "Three up, three down" is an inning in which a pitcher faces only three batters and none of those batters successfully reaches base.
  4. Manga chapter 65
  5. Manga chapter 66
  6. Manga chapter 67


Act I
Kanto Tournament
Yokohama Kouhoku Institute vs. Seidou High
89th Summer Koshien: West Tokyo Qualifiers
Maimon West High vs. Seidou HighPuplic Murata East High vs. Seidou HighAkikawa Academy vs. Seidou HighYakushi High vs. Seidou HighSensen Academy vs. Seidou HighSakurazawa High vs. Inashiro IndustrialSeidou High vs. Inashiro Industrial
Fall Tournament: Block Games
Seidou High vs. Metropolitan MinoSeidou High vs. Seishou Academy
Fall Tournament
Seidou High vs. Teitou HighSeidou High vs. Nanamori AcademySeidou High vs. Ugumori HighSeidou High vs. Ouya MetropolitanSeidou High vs. Seiko AcademySeidou High vs. Yakushi High
Act II
84th Spring Kōshien
Seidou High vs. Komadai Fujimaki
Spring Tournament: Tokyo Metropolitan
Inashiro Industrial vs. Yakushi HighSeidou High vs. Ichidaisan High
90th Summer Kōshien: West Tokyo Qualifiers
Yura Sougou vs. Seidou HighHachiya Ouji vs. Seidou HighYakushi High vs. Ichidaisan HighNorikane Academy vs. Seidou HighSeidou High vs. Sousei HighSeidou High vs. Ichidaisan HighSeidou High vs. Inashiro Industrial