Hiyori experienced intense, prolonged grief after her grandmother passed away, expressing this through constant crying. To alleviate her distress, her father built and designed a humanoid robot named Wasimo to resemble her deceased grandmother. This robot possesses dentures and exhibits a range of movement speeds: faster than a snail yet slower than a rhinoceros beetle, while also paradoxically capable of outrunning bullet trains. Wasimo's creation served as a direct intervention to comfort Hiyori during her mourning, addressing the emotional void left by her grandmother's absence.