Calming himself down, he returned to his seat, where he soon realized something else was wrong. He was being watched.

The target was looking directly at him through the monitor. The only camera showing the target was the high-altitude drone, meaning the boy had discovered its presence in the sky above him.

“Wait there. I’m on my way.” After picking up the target’s voice, the screen abruptly went black.

...

She followed Yogiri’s gaze upwards. A small machine equipped with a number of propellers was falling towards the ground, most likely her companion’s doing.

“It looks like a drone,” Mokomoko observed.

“A drone?! How is there a drone here?!”

“Surely it’s not that surprising. Like us, some other things from our world may have made their way here.”

“Someone was using it to watch us,” Yogiri explained.

“So, you felt the killing intent coming from that thing?” If that were the case, Yogiri’s ability should have been able to deal directly with the culprit behind the attack.

“It wasn’t really killing intent, but I can tell when something is watching me. It’s a pretty vague feeling, though, so I wasn’t able to put my finger on it until we got away from all the buildings.”

Within the city, Yogiri could generally feel the gazes of multiple security cameras on him. But here, where the previous battle had destroyed all other cameras, he was able to notice the drone watching from far overhead.

-Volume 4 pages 35 and 36