Anti-Japanese War Victory Sign-In System: Hand-Made Nuclear Bomb at the Start

Travel through 1937 with the "Victory Sign-in System", and a piece of "outrageous" black technology randomly explodes every 24 hours - today you hand-make a nuclear bomb, tomorrow you mass-produce Gundam, and the day after tomorrow you transform Mount Fuji into an active volcano! Unlimited upgrades → From "individual nuclear mines" to "orbital space-based guns" to "Star Destroyers", your combat power expands exponentially! Watch me crush the entire universe! ! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.