Description
Senpai holds a senior position at an unnamed trading company, where Kouhai-chan is his junior female colleague. He owns a cat named Fumi-chan.

His professional relationship with Kouhai-chan involves frequent interactions both during and after work. He often manages situations stemming from her occasional clumsiness or lack of awareness when it draws colleague attention. This includes accompanying her on social outings where her alcohol consumption leads to unpredictable behavior, requiring his intervention.

Their dynamic extends beyond the office, with Kouhai-chan visiting his residence partly due to their shared fondness for cats, allowing her time with Fumi-chan. During these visits, Senpai observes her personal activities, including participation in cosplay events and modeling, which sometimes results in photographs circulating among colleagues. He meets these situations with light teasing and tolerance, choosing to overlook her embarrassment rather than confront it directly, occasionally retaining personal photos she intended for others, indicating comfort and familiarity.

Senpai experiences professional side effects from this association, as male colleagues express envy or dissatisfaction regarding his frequent proximity to Kouhai-chan outside work hours. He navigates these dynamics with bemusement.

The character appears across multiple franchise installments: in the original animated series (Season 1) episodes 2, 6, 12, and the first OVA; in the second animated season (Tawawa on Monday Two) episodes 3, 6, 8, 9, 12, and the corresponding OVA; and prominently throughout the manga adaptation across numerous chapters spanning multiple volumes.