Ponkotsu Kawaii Mamiya-san: Shanai no Bijin Kouhou ga Tonari no Seki ni Isuwaru Ken

Fujishiro, a introverted office worker, is moved to the seat next to Mamiya-san, a beautiful senior colleague. When she finds out that Fujishiro is an expert on social networking, she eagerly asks him to teach her how to increase her followers.

In fact, Fujishiro has a secret alternate identity as a very popular camera-grammer with 340,000 followers. Without revealing the connection, he tries to help Mamiya increase her follower count ......!? The two of them will go on an aquarium date and eat dessert together. She would beg him to praise her for all her hard work today. Mamiya-san, who seems so brilliant at work, turns out to be rather clumsy, a voracious eater, and overly possessive, but she can also be very cute, in this workplace romantic comedy!

(Source: Fantasia Bunko, translated)