Sentai Filmworks licensed the rights to the show in North America and by Madman Entertainment in Australia and New Zealand.

High schooler Yūki Hase notices that his beautiful classmate Kaori Fujimiya is always alone and seemingly has no friends.

One Week Friends began as a one-shot manga by Matcha Hazuki and was first published in Gangan Joker's September 2011 issue.

[3] After spanning three years, the series came to an end in the February 2015 issue of Gangan Joker which was published in Japan on January 22, 2015.

The play stars Tomoki Okayama as Yūki Hase, Maya Okano [ja] as Kaori Fujimiya, Kimito Totani as Shōgo Kiryū, and Juria Kawakami as Saki Yamagishi.

Kimlinger wrote that Brain's Base and director Tarou Iwasaki provide the series with a style that's perfect, calling the minimalist backgrounds evocative with the right mood and the character animations superb, saying "that makes the show what it is: a sleeper delight, plain and simple.

"[21] Fellow ANN editor Gabriella Ekens praised the show for being "emotionally intelligent" with its showcase of Yūki's character growth and for being "beautifully realized" with its "faux-water color style" illustrating Kaori's progression and recovery from amnesia, concluding that: "One Week Friends is slice of life at its best.

"[22] Conversely, Allen Moody from THEM Anime Reviews criticized the "blandness and predictability" of the premise and its characters, singling out Saki for being "annoying on several levels", but commended the show's overall "inoffensiveness" and felt that both Shōgo and Kaori's mom Shiho were the only "genuinely good" people throughout the series.