An immensely popular original fanservice (often if not always centered around breasts) image series created by [[Himura Kiseki]] on Twitter as "offerings to the corporate wageslaves heading in to work on Monday mornings". Began on February 22, 2015 with "this tweet":https://twitter.com/Strangestone/status/569617644472573952. For over a year, it lacked any substantial commentary to go along with the images; during 2016, it started to bear some semblance of continuity, and a few reoccurring characters were given simple names for the first time.

Received an online 12-episode anime adaptation consisting of short five minute episodes starting on October 9, 2016, localized in English as [i]Tawawa on Monday[/i]. The series was given its own ending song by Ai's voice actress Harada Sayaka, but not an opening song.

The image series is also notable for distinctive [[blue theme|blue]] [[monochrome]] coloration.

h4. Characters
Female:
* [[Ai-chan (tawawa)|]]
* [[Ai-chan's kouhai (tawawa)|]]
* [[Ai-chan's mother (tawawa)|]]
* [[Ai-chan's sister (tawawa)|]]
* [[Announcer-san (tawawa)|]]
* [[Cheer-chan (tawawa)|]]
* [[Esper-chan (tawawa)|]]
* [[Fumi-chan (tawawa)|]]
* [[Gimai-chan (tawawa)|]]
* [[Gimai-chan's mother (tawawa)|]]
* [[Gurume-chan (tawawa)|]]
* [[Hokuro-chan (tawawa)|]]
* [[Holstein-chan (tawawa)|]]
* [[Jitome-chan (tawawa)|]]
* [[Kouhai-chan (tawawa)|]]
* [[Kunoichi-chan (tawawa)|]]
* [[Maegami-chan (tawawa)|]]
* [[Maegami-chan's daughter (tawawa)|]]
* [[Mangaka-chan (tawawa)|]]
* [[Mechanic-san (tawawa)|]]
* [[Ojou-sama (tawawa)|]]
* [[Ouji-sama (tawawa)|]]
* [[Rikei-chan (tawawa)|]]
* [[Rikujou-bu-chan (tawawa)|]]
* [[Sada-chan (tawawa)|]]
* [[Shika Eiseishi-san (tawawa)|]]
* [[Shiso-chan (tawawa)|]]
* [[Sotohane-chan (tawawa)|]]
* [[Tokumori-san (tawawa)|]]
* [[Trainer-san (tawawa)|]]
* [[Volley-bu-chan (tawawa)|]]
* [[Yang-chan (tawawa)|]]
* [[Yin-chan (tawawa)|]]

Male:
* [[Gimai-chan's stepbrother (tawawa)|]]
* [[Gimai-chan's stepfather (tawawa)|]]
* [[Jitome-chan's cousin (tawawa)|]]
* [[Kouhai-chan's brother (tawawa)|]]
* [[Onii-san (tawawa)|]]
* [[Senpai (tawawa)|]]
* [[Sensei (tawawa)|]]
* [[Volley-Bu-chan's Brother (tawawa)|]]
* Yakyuu-bu-kun
月曜日のたわわ