★Japanese Voice Actor: Rina Inoue
★English Voice Actor: Katelyn Gault
★German Voice Actor: Tanja Schmitz
★Spanish (LA) Voice Actor: Vanessa Olea
★Spanish (EUR) Voice Actor: Sara Heras
★French Voice Actor: Émilie Guillaume
★Italian Voice Actor: Jenny De Cesarei
★Portuguese (BRZ) Voice Actor: Tarsila Amorim
Fenneko's appearance is based on a Fennec Fox. She has light fawn fur across her entire body except for a dark fawn tri-point stripe down her forehead. Like Retsuko, Fenneko wears a navy blue vest and skirt, white dress shirt, and black shoes at work. Outside of work, Fenneko wears a baby blue turtleneck sweater, gray skirt, black tights, and brown boots.
Fenneko is quiet, perceptive, and can easily figure out what her co-workers are thinking just by watching their mannerisms. Fenneko thinks it's hilarious when Retsuko puts herself in embarrassing situations at work and is rightfully angered by how the higher-ups treat Retsuko. Fenneko is a self-proclaimed pro social media stalker, and while she is always right, Fenneko gets extremely upset if she thinks that she might be wrong in her observations.
★ "Tsunoda uploads a ton of photos, but there's a method to the madness. Take a look. Selfie, dessert, latte art. Selfie, dessert, latte art. Selfie, dessert, selfie, dessert, selfie, selfie, a thigh pic."
★ "You're the sort who goes to crazy lengths to get the job done, right? Bosses can smell your kind a mile away and that's why they're so quick to pile that extra work onto you. It means you're no more than a cowardly robot who's ensnared by corporate expectations. A willing slave, willing to work herself to death at the drop of a hat. It's like you're the patron saint of sweatshops across the world. Oh. Sorry. You'll be okay."
★ "So Retsuko usually goes straight to the train station after work, but lately there's two days of the week where she heads in the opposite direction. Wherever she's going, it's too close to take the train. And twice a week means that it's probably some kind of ongoing thing. She's been complaining about sore muscles lately, so I bet that it's physical. Retsuko's not the kickboxing or rock wall type, so I guessed either Pilates or yoga, so I searched by my location and BAM! Jackpot.'"
★ "Ton won't be able to fit his head through the door by the time [Tsunoda] is done with him. If I kissed even a fraction of that much ass, I'd drown myself in shame."
★ "You're becoming one of them, aren't you?! One of those people who live for social media and would give their first born for a couple of likes and reposts!"