- He is the younger brother of animator and artist, Yukiko Horiguchi.
- During the SAO panel in Anime Expo on July 5th, it was revealed that abec's older sister is Horiguchi Yukiko, the character designer of K-On, Kokoro Connect and Tamako Market. Horiguchi Yukiko herself was also reported as using an alias Shiromisakana to provide the end card image for Sword Art Online Episode 14 and draw illustrations for light novels such as Kokoro Connect and others.
- Abec is self-claimed to be a high school girl.
- The programming guide of Anime Expo 2014 claimed that abec is actually a man in his 20's.
- He graduated from Ôtani Junior and Senior High School.
- Abec placed first in the Top 10 Illustrators in the Kono Light Novel ga Sugoi! 2013 awards. He placed sixth back in 2011, third in 2012 and 2014.
- Abec, with author Reki Kawahara, and producer Kazuma Miki, was invited as a guest of honor to Anime Expo 2014.
- Abec took part in the Ordinal Scale panel at Sakura-Con 2016, where he drew different characters in their movie outfits during the panel.
- He is a member of SSS by applibot.
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