It Came — the Cub Crosses Window 4's Glass, Now Under Protective Watch in Oji

The cub did not stay on the other side. Stable Window 4, "the Giant Plains" (Lineage 63), opened at 3:51 a.m. on the 5th. According to the Dimensional Survey Division, the young giant first behaved as it had on the night previously reported on October 28th, stopping roughly 30 meters short of the window. But around 4:18 a.m., it began moving again — and this time it did not stop. It pressed against the observation glass, which cracked outward from its center into a hole large enough for a person to pass through.

The window keeper on duty, Wataru Takagi, 34, a second-generation drifter of the rabbit lineage assigned to the Dimensional Survey Division, was seriously injured by falling glass to the head and right shoulder and was taken to the hospital by ambulance. He is conscious; further details of his condition have not been released. The division normally withholds the names of individual window keepers, but said that, given the unprecedented nature of the case, it was disclosing his name with his and his family's consent. A second, senior keeper in the same room escaped with minor injuries and is recorded as having pulled Takagi out of the room immediately after the cub came through.

■ About 2.4 Meters Long, Taken In Alive

The cub that crossed the glass measured roughly 2.4 meters in length, broadly consistent with the previously reported estimate of "about a tenth the size of an adult." TDA's biological management division secured the animal in a transport enclosure it had kept on standby near the window room and moved it the same day to a dedicated holding facility. "It wasn't violent — if anything, it looked disoriented," an official said, adding that the cub showed no notable injuries and was in stable condition.

■ Not Removal, But "Protective Observation"

The division initially considered invoking removal procedures modeled on the September 2nd Edagawa case involving a designated drift species, but decided against it the same day. TDA Director Makoto Hiura told an emergency briefing, "The subject is a young animal that has shown no sign of hostility toward us. This is not Edagawa. We will handle this under a framework of protective observation, not removal." Officials described the framework only in broad terms: joint round-the-clock monitoring by the biological management and dimensional survey divisions, tracking the cub's condition and behavior, with the length of confinement and its ultimate disposition to be decided with expert advice.

Etsuko Kajiura, 58, the University of Wangyo professor chairing the panel of outside experts, previously reported, said, "When I noted on October 28th that the weight of the ethics debate might shift now that a child was involved, I never imagined it would actually cross over. There is a living individual in front of us now, with neither the principle nor the intent behind it understood. The premise of our discussions has changed." She said the panel will take the matter up as a priority item in November.

■ Why Did the Glass Break?

Until now, the glass at stable windows had, at most, trembled enough to shift teacups during an adult giant's footsteps (previously reported September 7th and 14th), but had never broken. "We cannot yet separate whether there was a flaw in the glass itself, whether the cub's impact was stronger than expected, or whether something about the window's nature changed only this once," the division said. Tokei Precision Optics, which supplies the glass used in the window apparatus, issued a same-day statement saying it would "cooperate fully with TDA in determining the cause."

The division stressed that the basic rules — one-way passage, no control over the phenomenon — have not changed. "Things have rarely come across before, as drift objects or drifters. What's new is that a large, living individual came through a window we observe continuously — the rule itself wasn't broken." Why the cub failed to stop this time remains, by the division's own account, unexplained.

■ Voices From the Window Room

A fellow keeper recalled, "Takagi was also on duty the night of October 27th, when the cub first approached. That night he laughed and said, 'I hope it comes again.'" "No one imagined that what we hoped would come would come by breaking the glass." As at other windows, the Oji window room had teacups lined up on its sill; this time, the division said, they were found on the floor among the broken glass, and will be logged along with everything else.

■ The Room's Design, and What It Never Anticipated

The Window 4 room was designed, when it entered service in December 2025, to withstand tremors from the giant's footsteps. As previously reported (September 7th and 14th), those tremors had only ever shifted teacups on the sill by a few centimeters; a direct impact on the glass itself fell outside what the design anticipated. A TDA facilities officer admitted, "We tested resistance to vibration, but a scenario where an individual made direct contact with, or rammed, the glass was not part of our design assumptions." The division said it would review the same assumptions at the other four windows.

The glass used at Window 5, "the Sword Country," and Window 2, "the Sea of Mechanisms," among others, comes from the same product line. The division announced an emergency inspection of the glass at all five windows this week, saying that any window found to have a problem could be temporarily closed.

■ Inside the Holding Facility

The room where the cub was moved is a space secured specifically for this case, separate from the biological management division's existing facilities used in cases such as the Edagawa incident. "Based on its calls and behavior, it appears to be the same species observed in the settlement on the other side, but formal classification is still ahead of us," an official said. On feeding, the division said, "Since we don't know what it eats, we are offering only water for now and watching its response," adding that it would proceed cautiously with expert guidance.

Reporters and other parties have already gathered outside the facility, though filming inside has not been permitted. TDA said that if the cub's condition stabilizes, it may release photographs within careful limits.

■ What Is Known, What Is Not

- Known: the cub, about 2.4 meters long, was taken in alive and is stable. The glass cracked from its center; one keeper was seriously injured. TDA chose protective observation over removal. - Not known: why the cub failed to stop; the physical cause of the glass breaking; whether the cub acted alone or as part of some intent from the herd; what will happen after the observation period ends.

TDA said it would provide further updates on the cub's condition and on repairs to the window room.