The December issue of Shogakukan's Monthly Flowers magazine published the final chapter of Yumi Tamura's 7SEEDS spinoff manga on Saturday. The spinoff manga will be compiled into book form and published in early 2018.

The magazine also revealed that Tamura will launch a new manga titled Mystery to Iu Nakare (pictured at right) in the next issue on November 28. The manga will be on the cover, and the 100-page first chapter will feature a color spread.

Tamura published a one shot manga last year with the same title. Shogakukan's Zōkan Flowers will republish the 78-page one shot in its winter issue on November 14 to commemorate the new Mystery to Iu Nakare series.

The original one shot revolved around two detectives who come across the mystery of a university student named Totonō Kunō. The student is suspected of murdering his classmate Sagae after Sagae's body was discovered in a neighborhood park.

Tamura ended the original 7SEEDS manga in the magazine's July issue and launched the spinoff manga in the October issue on August 26.

The original series centers on Natsu, who suddenly wakes up one day to find herself in the middle of the ocean. She's with six other strangers, and none of them remember how they got into their current situation. They end up stranded on an island, where a "guide" explains to them that they are part of a government project to cryogenically preserve groups of people to ensure humanity's survival after scientists predicted the destruction of the world. Natsu's group finds that they are in Japan after a catastrophe, and must learn how to survive in their new post-apocalyptic reality.

The original manga's 35th and final volume shipped on August 10. A limited edition of the 35th volume included a drama CD.

Tamura launched the series in 2001 in Bessatsu Shōjo Comic magazine, before eventually moving it to Monthly Flowers. The manga won the Shōjo Category of the 52nd Annual Shogakukan Manga Awards in 2007. Shogakukan published a fanbook for the manga, 7SEEDS Official Fanbook: Edge of Emotions, in 2011.

Tamura's 27-volume Basara manga ran in Bessatsu Shōjo Comic from 1990-1998. Viz Media published the manga in English in 2003-2008. The manga inspired the 13-episode Legend of Basara television anime series in 1998.

Viz Media also published Tamura's two-volume Chicago manga in 2002-2003, and her one-volume Wild Com manga in 2004.

Tamura's Tomoe ga Yuku! manga inspired an OVA series in 1991-1992.