Kochira Katsushikaku Kameari Kouenmae Hashutsujo: Seton Tankentai! Sumidagawa no Chikai - Omoide no Shiroi Kujira wo Sagase!

こちら葛飾区亀有公園前派出所シートン探検隊!隅田川の誓い〜思い出の白い鯨を探せ!〜

The two-part Kochikame special, wherein Ryoutsu helps a zoologist friend capture a real white whale.