The short takes place at the KDDI R&D laboratory, where scientists are creating a telephone that can call the future, but an incident occurs when they are using the phone. (Source: ANN)

A menace of huge monster-like insects is plaguing the land of Edo. Too powerful to be subdued by ordinary folks, the creatures are hunted by the Insect Magistrates—a group of warriors who specialize in various secret arts and combat styles. To bolster their strength, they summon Genjuurou Tsukishima, the master swordsman from the Tsugaru Province. Due to an unfortunate incident, however, Genjuurou is incapable of answering the call and sends his son, Jinbee, to serve in his stead. Determined to atone for the incident caused by his own cowardice, Jinbee agrees to travel to Edo and join the Insect Magistrates. Armed with his fiery spirit and unwavering resolve, Jinbee vows to become a stronger samurai and rid Edo of the insect threat once and for all.

The docks provide a look into the very essence of ocean life—the calm, rhythmic sounds of the waves, the small bugs skittering across the pier, and—mermaids!? Takurou Mukoujima's quiet days spent fishing are no more when he reels in the energetic mermaid Muromi-san, who proceeds to entertain herself around her newfound friend, even if he is obviously disinterested. Now with a talkative and reckless companion always by his side, Takurou struggles to avoid getting caught up in Muromi-san's pace as she starts to invite her deep-sea friends, making the dock a popular gathering place for mythological creatures. Every day might be new and exciting, but all Takurou really wants is to fish in peace!

Madara, nicknamed Nyanko-sensei, runs into two young children when he gets separated from his temporary owner Takashi Natsume. Unequipped to handle kids, Nyanko-sensei tries to wriggle his way out; but fearing for their safety around the ravenous forest youkai, he decides to escort the siblings to safety. However, even for an all-powerful youkai such as Nyanko-sensei, dealing with the playful and overly curious nature of children can prove to be an exhausting challenge.