Episode 1
Kominato Ryousuke returns home after being away for 10 months and bonds with his younger brother Haruichi.

Episode 2
Despite being a trouble-maker, Kuramochi gets an offer to play in Seidou High School.

Episode 3
The story of Kawakami Norifumi during his first year in Seidou High.

Source: Wikipedia

Note: Episode 1-3 were bundled with 44th-46th Ace of Diamond manga volumes and Episode 4-5 with 4th and 5th manga volumes of Diamond no Ace Act II.

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Other: Dia no Ace