Daisuke Higashida gets a job at the restaurant because of family financial difficulties, but no one who works there is normal. 
 
(Source: Anime News Network)

Set in a family restaurant in Hokkaido, the northern prefecture of Japan, 16-year-old high school student Souta Takanashi works part-time along with his strange co-workers: Popura Taneshima, a high school girl who's a year older than Souta, yet easily mistaken for an elementary/middle schooler, and Kyoko Shirafuji, the 28-year-old store manager who doesn't bother to do any work at all. 
(Source: NIS America)

Web-ban Working!! is a web comic written and illustrated by Takatsu Karino, which she published in irregular intervals on her personal website since 2002. It is the origins of the serialized version of Working!! in the Square Enix's Young Gangan manga. 
The web comic's setting and characters are different from the later four-panel comic strip manga. While the restaurant in the web comic and manga are both called Wagnaria, they are different branch stores, so the world is the same. For example, Sakaki Kenichirou, the web comic's store manager, is an old friend of Shirafuji Kyouko and Adachi Masahiro from the web comic is a band mate of Satou Jun from the Young Gangan version. The author called the web comic version Neko-gumi (&#29483;&#32068; - Cat Group) and the serialized manga version Inu-gumi (&#29356;&#32068; - Dog Group). 
(Source: Danbooru)

Several characters announce the new season. 
Episode 1 - April Fool Announcement (Hana and Daisuke) 
Episode 2 - True Announcement (Aoi, Poplar, and Souta)

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