The April issue of Shueisha's Bessatsu Margaret magazine revealed on Wednesday that Ayuko Hatta's Haibara-kun wa Gokigen Naname (Haibara's in a Bad Mood) manga will end in the magazine's next issue on April 12.
The manga's story centers on Mio, a girl who is treated as her class' mascot, who gets to know a transfer student named Haibara, who doesn't like her. However, Mio is in danger of repeating a year, and will stop at nothing to get the studious Haibara to help her pass.
Hatta launched the manga in Bessatsu Margaret last May. Shueisha published the manga's second compiled book volume on January 25.
Hatta launched her Wolf Girl & Black Prince manga in Bessatsu Margaret in 2011, and ended it in May 2016. Shueisha published the manga's 16th and final compiled book volume in the same month. As of May 2016, the manga has 5.4 million copies in print.
The manga inspired a television anime in 2014, as well as a live-action film, which opened in Japan in May 2016. Crunchyroll streamed the anime as it aired in Japan, and Sentai Filmworks released the series in North America in March 2016.
Source: Bessatsu Margaret April issue