Diamond no Ace Wiki
Umemoto Sachiko
Seidou High School
Bats: - Throws: -
Kanji 梅本 幸子
Nickname Sacchin
Gender Female
Age 16 (debut)

17 [1]

Date of birth 12 March
Height 153 cm
Weight 43 kg
Education 2nd Year High School (debut)

3rd Year High School [1][2]

First Appearance
Manga Act I - Chapter 7
Anime S1 - Episode 4
Voice Actor Yumiri Hanamori

Umemoto Sachiko (梅本 幸子) is a student of Seidou High School and one of the managers of the Seidou Baseball club who is very enthusiastic about baseball and is typically scorekeeper for first string games.


Sachiko prefers to tie her hair to two ponytails.

Relationship with other characters[]

Natsukawa Yui[]

Sachiko and Yui know each other well and joined the baseball club together. They are in the same year of high school. Sachiko knows that she can rely on Yui and vice versa. They trust each other blindly regarding their work as team manger.

Fujiwara Takako[]

Takako is Sachiko's reliable sempai. It was a tearful farewell when Takako and the other third years retired.

Yoshikawa Haruno[]

Haruno is a fellow manager and one year younger then Sachiko and Yui, and thus their kōhai[3]. But Haruno is very clumsy. As a result of her clumsiness, she often makes more work for her seniors, which leads to them getting angry sometimes. But after some initial difficulties they get to know each other really well and start to work together as reliable teammates.


  • Umemoto means "Japanese apricot, plum" (梅) (ume) and "base, root, origin, source" (本) (moto).
  • Sachiko means "happiness, good luck" (幸) (sachi) and "child" (子) (ko).




  1. 1.0 1.1 Act I - Chapter 412
  2. Act II - Chapter 1
  3. In Japan, kōhai (後輩) is a junior.