There is a Japanese word for it: 日和見 (hiyorimi) — literally 'watching the weather.' It describes the art of reading which way the wind blows before you commit, of holding back until survival is the only calculation. Todo Takayuki, the eleventh daimyo of Tsu Domain, was a master of it. In February 1868, he gave the word its most famous modern illustration.

Tsu Domain was one of the most strategically located domains in Japan. Situated on Ise Bay in present-day Mie Prefecture, it sat astride the Tōkaidō (東海道, Tōkaidō) — the great road that linked Kyoto and Osaka to the shogunal capital of Edo. Whoever controlled Tsu controlled movement between the imperial heartland and the shogun's city. Both sides knew it. Takayuki knew they knew it.

When the Boshin War (戊辰戦争, Boshin Sensō) broke out in late January 1868, Takayuki did what experienced fence-sitters do: he declared neutrality. The conflict between Satsuma and Chōshū (長州, Chōshū) on one side and the shogunate on the other was, he announced, a private dispute. Tsu would not take sides. It was a position that required believing — or pretending to believe — that a civil war was a personal quarrel.

His domain had reasons for caution beyond mere self-interest. Tsu had been suffering: bad harvests, devastating earthquakes, accumulated debt. Takayuki governed a domain weakened by years of misfortune, not the powerful ally either side might have hoped for. But his strategic location meant his choice would matter regardless of how many soldiers he could field.

The Battle of Toba-Fushimi (鳥羽伏見の戦い, Toba-Fushimi no Tatakai) ended the calculation. The shogunal forces were routed in four days; the shogun himself had fled Osaka by ship. On February 5, Yodo Castle — held by one of the shogunate's own senior councilors — had shut its gates on the retreating army. The shogunate was not merely losing; it was being deserted by its own infrastructure.

On February 6, an imperial messenger arrived at Tsu. The timing was not coincidental. The imperial side had been watching Tsu, and they sent their messenger after the outcome was no longer in doubt — offering Takayuki a path to the winning side that cost the imperialists almost nothing, since they had already won. Takayuki's local commanders moved quickly. Tsu domain forces were committed to the imperial cause.

What followed had a dark poetry to it. The Tsu troops did not simply declare allegiance — they attacked the shogunal army that was already retreating past their domain, hitting men who had already been refused shelter at Yodo the day before. Former Tokugawa allies becoming the instrument of the Tokugawa's final humiliation on the road south.

The ancestry behind this act was not lost on anyone who knew the history. The Todo clan had its origins in the brilliant, ruthless career of Todo Takatora (藤堂高虎, Tōdō Takatora) — a man who had served seven different lords over his lifetime and prospered under each. He had fought for Tokugawa Ieyasu at the Battle of Sekigahara in 1600, the decisive clash that created the Tokugawa shogunate. His reward was the 320,000-koku Tsu Domain and a place among the most powerful daimyo in Japan. That reward had compounded across eleven generations. Todo Takayuki had inherited a dynasty built on Tokugawa loyalty.

He spent it in a single day.

The aftermath was not the triumph a successful bet might have warranted. Todo Takayuki was appointed imperial governor of Tsu — the Meiji government's acknowledgment that his domain was too important to ignore and too opportunistic to fully trust. His own people did not celebrate his decision; uprisings broke out almost immediately after his appointment. He governed an angry domain until his retirement in 1871, when the abolition of han (藩, han) — the old domain system — made the entire question moot. He lived until 1895, long enough to see a Japan that had no use for the old loyalties he had twice abandoned.

Tokugawa loyalists applied the same epithet to him and to Inaba Masakuni of Yodo: 裏切り者 (uragirimono). Treacherous dogs. Both men had done essentially the same thing — read the weather and chosen the winning side before they fully had to. Both were rewarded with positions they couldn't hold. Neither satisfied anyone. In the wreckage of the samurai order, hiyorimi turned out to have a very short shelf life.