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

Mamiya-san is an office lady with a beautiful face and a generous bosom, who has moved into the seat next to Fujishiro, an introverted salaryman. After learning that Fujishiro is knowledgeable about SNS algorithms, Mamiya-san wants to know how to increase her followers...!? An office love comedy will unfold as Fujishiro tries to help Mamiya-san while hiding the fact that he is "Nisai-san," an influencer whom Mamiya-san admires very much.

(Source: ComicWalker, translated)