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Senpai ga Uzai Kouhai no Hanashi - MangaDex
https://mangadex.org/title/af38f328-8df1-4b4c-a272-e737625c3ddc/senpai-ga-uzai-kouhai-no-hanashi
Futaba Igarashi is a diminutive office lady who finds that her towering and boisterous work senpai Harumi Takeda always gets in her hair, but he always has her back, he always keeps her company, and she starts noticing that her heart is slowly veering towards him… 1st place of Tsugi Manga Awards, Category Webmanga (2018)