Hayato Shindou (alternatively romanized as Shindo) is a late 20th-century Japanese middle school student defined by his passion for soccer. His routine visit to Dr. Leonard’s laboratory culminates in the accidental activation of Tondekeman, a sentient time-traveling kettle. This event propels him and his classmate Yumi Arama to 9th-century Baghdad, immediately separating them from the device and stranding them in the past. Their predicament sparks a journey across diverse historical epochs.

He consistently wears a headband, soccer supporter wristband, short-sleeved shirt, shorts, and barefoot-style sneakers. His athleticism proves crucial, as precisely aimed soccer kicks repeatedly resolve confrontations and obstacles. Regular pre-displacement visits to Dr. Leonard’s lab also grant him mechanical aptitude, occasionally aiding the group. Facing challenges, he exhibits adaptable optimism, habitually reassuring others with the phrase "It’s fine."

His bond with Yumi Arama stems from shared school ties and mechanical curiosity; they navigate ancient settings using a scooter from their original era. Throughout their travels, they forge alliances with figures like Aladdin—a young thief viewing Hayato as an older brother—Prince Dandarn of Baghdad, and Princess Shalala. Hayato frequently engages in efforts to rescue Shalala from recurring kidnappings orchestrated by the sorcerer Abdullah.

The central conflict revolves around pursuing Abdullah across time to reclaim Tondekeman. This quest brings encounters with myriad historical and literary personalities in varied locales. While Hayato’s mechanical skills intermittently assist the group, their unwavering goal remains recovering the device to return home. His personality and role within the ensemble remain consistent throughout these events.