Hatsuse Okahashi is a first-year student at Bansei High School and a supporting character of the spin-off manga "Saki Achiga-hen episode of side-A". She is a former member of Ada Middle School's mahjong club with Ako Atarashi. Hatsuse is an admirer her senior Yae Kobashiri in Bansei's mahjong club.

The Achiga Girls' Academy in Nara once defeated regional mahjong powerhouse Bansei High School. It advanced into the national team semifinals but lost to the eventual champion, and the mahjong club was later disbanded.<br><br>
Six years later, elementary school student Shizuno Takakamo befriends transfer student Nodoka Haramura. The two eventually enter Achiga Girls', but Nodoka transfers out of the school in the second year. <br><br>
When Shizuno sees Nodoka on television the following year as the national middle school individual mahjong champion, she decides to revive Achiga's mahjong club.

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She announced on June 8th, 2024 that she got married to fellow voice actor [Tatsumaru Tachibana](https://anilist.co/staff/137436/Tatsumaru-Tachibana).

The final 4 episodes of Saki: Achiga-hen - Episode of Side-A.

The Achiga Girls' Academy in Nara once defeated regional mahjong powerhouse Bansei High School. It advanced into the national team semifinals but lost to the eventual champion, and the mahjong club was later disbanded. Six years later, elementary school student Shizuno Takakamo befriends transfer student Nodoka Haramura. The two eventually enter Achiga Girls', but Nodoka transfers out of the school in the second year. When Shizuno sees Nodoka on television the following year as the national middle school individual mahjong champion, she decides to revive Achiga's mahjong club.