Тенноджі Юґо

Owner of the CRT TV Workshop set up in the first floor of the Oohiyama building. Also the landlord. Widower. Has an only daughter by the name of Nae, though he's the only one who loves CRTs. Hates LCDs with a passion, and perhaps anarchic. Though he's not quite enthusiastic in the CRT TV Workshop, for some reason he doesn't seem like he'd go bankrupt anytime soon. Nicknamed "Mr. Brown" by Rintarou, due to the loan word "Braun" used in the Japanese term for CRTs (ブラウン管). In episode 20, it is revealed that he's actually a veteran SERN henchman. In the Alpha world line, he was acquainted with Suzuha (who traveled back to 1975 and took the name "Hashida Suzu") and was taken care of by her for some time.

He commands the Rounder unit (including Moeka) in Akihabara, under SERN's order to search for the IBN 5100. After Moeka successfully stole it, he was responsible for transferring the computer to SERN. In the anime, after Moeka and Rintarou found out about his identity, he confessed that he got close to Suzuha due to SERN's order. As Rounder members were to kill themself after finishing their mission, in order to protect his daughter, he killed Moeka and himself. In the VN, after he found out the relation Hashida Suzu had to the time machine and the future, he regretted his actions, and committed suicide. His death caused Nae to become vengeful, especially against Okabe and Moeka.

She later became the Rounder commander, and killed Okabe in 2025, then time-leaped 15,000 times back to the time of his death to kill Moeka.