The translator says :
The enemy bullets (cumulative) to 10 million. (Arrange mode only)
Thats mean : The enemies to fire a total of 10 million bullets, cumulative across all plays.
How to do :
The "easiest" way :
1) Download the first gameplay at the scoreboard with Tateha 99*99 level.
2) Watch the entire gameplay through the end (you can speed it up, no problem).
3) Select 99*99 level at game settings for Tateha. DON'T touch any other setting.
4) Playing as Tateha and the enemies shoot at you with maximum bullets.
5) Play the Game to the end and repad it many times, its a long ride...