The ROM cartridge has 32kB, plus 256kBit sample ROM and DAC (NEC D7756C) to play samples. It's mostly voices (STRIKE!, OUT!, etc.) and sound effects (bat hitting ball).
The game is also listed in the Aackosoft Summer '87 brochure, but only as a tape and disk release with the product codes of the game "Lode Runner II". As this game has the special sound effects chip, it's unlikely to have been really released on disk and tape and the info from the brochure is probably wrong.