On the Rainy Night at the Beginning, I Became Kudo Shinichi's Brother

When I woke up, I became Kudo Shinichi's older brother. System prompt: [Novice mission: Pick up the shrunken younger brother at 2-chome 21, Mihua Town] On a rainy night, I wrapped the shivering little detective in a windbreaker and said, "I'll take you in if I call my brother." Later, the black organization discovered that there was a more terrifying existence behind Kudo Shinichi—— I changed the forensic report, I cut the bomb wiring, and even the antidote for APTX4869... I prepared it by hitting Gin on the head with a test tube.