WARNING: This post contains spoilers.
Kuitan Episode 2 - Eat all of Chinatown
A Chinese restaurant owner was found dead, floating in the river; his wife, though relatively unharmed, was taken to a hospital to be treated for shock while their young son Yan was under police custody. Igarashi, Momo-chan's subordinate, entrusts Yan-kun to Holmes Agency, promising extra money for 'babysitting' the victim's son while the murder investigation is ongoing. Meanwhile, an autopsy on the victim revealed that his stomach contained tofu, ground meat, chili peppers, miso and green onions - ingredients for Mabo Tofu. This lead investigators to believe that if they can find the restaurant where he last ate, they will find the murderer. Thus, Kuitan's services had been enlisted again.

By japinoy
Mabo Tofu - Mmm...oishii!
As Kuitan makes his rounds of Yokohama Chinatown's almost 200 Chinese restaurants, Ryohsuke and Hajime-kun (aka Kindaichi, aka the bratty kid who keeps on losing his cat) were kidnapped by goons who mistook the kid as Yan, the victim Wong's son. Eventually realizing their mistake, they let Kindaichi go, with the orders to bring back Yan-kun as his replacement. If he will not do as he was told, they will kill Ryohsuke. Kindaichi made his way back to Holmes Agency, pretending to look for his cat and would not talk about his abduction. Eventually, Kuitan managed to get through to him by a good sermon, a meal and a good whack to the head.

By japinoy
Ryohsuke and Kindaichi plead with their kidnappers
The police learned that Wong was killed over a card-skimming device (used for fraud) - that was cleverly hidden inside Yan-kun's game console. Now, after learning their deal with Kindaichi, they decided to use Yan-kun as bait. Meanwhile, Kuitan, Kyoko and Kindaichi scour the city for Ryohsuke's hiding place.

By japinoy
Kuitan, Kyoko and Kindaichi pretending to be out on a family dinner
*** SPOILERS BEGIN HERE. Highlight below to read. ***
It was almost past the kidnappers' deadline when Kuitan dragged Kyoko and Kindaichi inside a Japanese restaurant. Expectedly, the two protested and insisted that they look for more Chinese restaurants instead. Kuitan did not listen and asked them to pretend to be a family while they ordered traditional Japanese fare - niku dango (meatballs), hiyayakko (cold tofu) and natto (fermented soybeans). These same ingredients are also used to make Mabo Tofu! Kuitan and company concluded that Ryohsuke was being held captive in that same restaurant. Kuitan and company were finally able to rescue Ryohsuke, but not after an exciting 'combat' involving a knife (bad guy #1) and a pair of chopsticks (Kuitan).
The murderers were eventually captured, and the Minato Police awarded certificates to each of the Holmes Agency member - including Kindaichi, who is now an official member of the group.
*** SPOILERS END HERE ***

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