Kanini and Kanino are tiny anthropomorphized freshwater crab siblings who live underwater in a nearby stream.

[2] They announced that the first volume would be titled Modest Heroes, and would consist of three short films by former Studio Ghibli staffers Hiromasa Yonebayashi, Yoshiyuki Momose, and Akihiko Yamashita.

[2] Yonebayashi's 18-minute "Kanini & Kanino" (カニーニとカニーノ, Kanīni to Kanīno) is a fantasy adventure film with music composed by Takatsugu Muramatsu, who had previously worked with the director on When Marnie Was There and Mary and the Witch's Flower.

[1] Momose's 16-minute "Life Ain't Gonna Lose" (サムライエッグ, Samurai Eggu) is a drama film scored by Masanori Shimada.

[1] The anthology's ending theme song is "Chiisana Eiyū" ("Modest Heroes") by Kaela Kimura.

[3] The film was originally intended to have four rather than three segments, with the fourth being directed by Ghibli director Isao Takahata.