Manabu Inose was the one vandalizing Kazuki Kumagai's fields in the hopes his crops would be destroyed before harvesting season. He was the one who cut the fences and destroyed the scarecrows. He later planned to release wild animals so they would rampage through Kumagai's fields, by using his expertise in hunting. He managed to release the raccoon, but his planned failed when the wild boar he released and starved for several days rammed through him instead of the melons, causing him to fall and go unconscious. The boar then dug a hole in the ground and escaped.
After the big reveal, the police officer receives a call from the local hospital saying that Inose regained consciousness, and the three other farmers decide to come see him and knock some sense into him, but promise they will help him with his crops, as jealousy was most likely the cause of his wrongdoings. Sleeping Kogoro however reveals that the case is not finished. Later at night, a black van stops in front of the fields and five thieves come out and prepare themselves to steal Kumagai's melons, but the lights turn on and they are intercepted by Kogoro, the police and the three farmers, who decide to beat them. Conan reveals that "Sleeping Kogoro" had noticed the suspicious van earlier that day and also saw fluorescent tape on the greenhouse's door, and since neither Inose nor the animals would need to use it, it was most likely used by robbers who wanted to come at night.