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I stumble this secret boss by coincidence, and I think this secret boss only appear once per day, this is my 7th attempt battle this secret boss.
Seems the ending explosion too heavy for my computer, but it feels awesome having massive slowdown while watching boss exploding

Lethal Operation is Daisessen bullet hell RPG, release at c87, very good games although sometimes script error happen and force close the game. There's no wiki, I'm blindly playing this game.

Download link? I found this game in nyaa.se with "Lethal Operation" as keyword search.