[1] The main premise of Kyō no Go no Ni is the school life of the fifth year class 5-2 (age 11–12), focusing on an elementary-school boy named Ryōta Satō.

Xebec produced a thirteen episode anime adaptation directed by Tsuyoshi Nagasawa, unrelated to the OVAs.

[2] The story begins when they are both now in their fifth year of elementary school in class 5-2 together with their group of friends Yūki Asano, Kazumi Aihara, Natsumi Hirakawa, Megumi Hidaka, Kōji Imai, Tsubasa Kawai.

[6] The volume features Chika as the cover character in addition to two omake chapters entitled Supplementary Lesson - "Today in Tennis Club" and Invitation.

[7] Kyō no Go no Ni was adapted into an OVA by Shinkūkan in 2006, directed by Makoto Sokuza and written by Miki Okitsu.

[9] It featured three theme songs, one opening and two endings that were all sung by Mai Kadowaki, Mamiko Noto, and Mikako Takahashi.

[11] Kyō no Go no Ni was adapted into an anime by Xebec, directed by Tsuyoshi Nagasawa, written by Takamitsu Kouno, and produced by Starchild Records.

All the ending themes feature the voice actors for the main characters: Yū Kobayashi, Asami Shimoda, MAKO, Satomi Akesaka, Yōko Honda, and Kana Asumi under the band name Friends.

[16] An official fanbook was released on December 22, 2008, by Kodansha with an ISBN of 978-4-06-375627-2 and Yūki, Chika, and Kazumi as the cover characters.

This single contained "Nisemono" and "Secret Base (Kimi ga Kureta Mono)" in original and instrumental versions as sung by the group, Friends.

A studio album of twelve tracks was released on January 7, 2009, entitled Best Friends, by King Records under the catalog number KICA-950.

It included all six of the theme songs as sung by the group, Friends: "Nisemono", "Secret Base (Kimi ga Kureta Mono)", "Daibakuhatsu No.1", "Natsu Matsuri", "Yūyake Iro", and "Negai.

[18] Anime News Network's Carl Kimlinger praised the 2007 OVA's characters design as "smooth" and "shiny".