Sumanai is a casual Japanese way of saying sorry or excuse me, and this clip is shared by fans of Fate/Grand Order, the mobile role playing game in the Fate series first released in Japan in 2015. Within anime and gaming communities the drawn out delivery became a handy shorthand for an exaggerated apology, especially around unlucky summons and in game mistakes. It spread through fan edits, streams and soundboards, where a short familiar voice line can react faster than a typed message, and it remains popular for polite, self deprecating humour.