TV-Series
Description
Hiyoko Isshū is a central character in the Tentō Mushi no Uta anime, known as the second daughter of the Isshū family. Her name represents Sunday, continuing the family motif where each of the seven orphaned siblings is named after a day of the week. As the youngest member of the household, Hiyoko is five years old and does not yet attend school due to her age.

In terms of personality, Hiyoko is portrayed as a naughty and precocious child, yet she remains a friendly and warm-hearted girl who cares deeply for her family. Despite her young age, she demonstrates remarkable initiative and a strong will. Her character serves as a catalyst for the family's survival following the tragic death of their parents. The story begins when the seven siblings present their parents with a trip as a token of gratitude for their love and care, but this well-intentioned deed leads to a terrible misfortune when their parents are killed during their travels. After this devastating loss, the children must learn to stand on their own feet without depending on anyone else, and Hiyoko plays a key role in this struggle.

Hiyoko's most significant act is finding a ladybug, which she names Tentomushi. This discovery is portrayed as the foundation of the family's new lifestyle, and she is considered the founder of their way of living as they support one another with brotherly affection. Her bond with the ladybug symbolizes hope and the small blessings that help the family persevere through hardship. Her motivations are rooted in love for her siblings and a desire to keep the family united, traits that become especially important given that her six brothers and sisters range in age from six to eleven years old.

Regarding her key relationships, Hiyoko interacts closely with all her siblings. Her eldest sister is Tsukimi, an eleven-year-old who struggles with her motherly role in the family. Her eldest brother is Kaji, a ten-year-old who scolds the younger siblings when they do not cooperate and works hard to fulfill a fatherly role despite his poor grades at school. Other brothers include Mizuo, a nine-year-old prodigy who wants to be a scientist; Mokusuke, an eight-year-old who is overweight but kind-hearted and wishes to become a priest; Kintaro, a seven-year-old school bully who is otherwise very kind; and Tsuchimaru, a six-year-old who is intelligent, friendly, and dreams of becoming a detective.

As the series progresses, Hiyoko demonstrates notable development in her maturity and sense of responsibility. Although she begins as a mischievous young child, she gradually becomes more dependable, contributing to the household's daily struggles and triumphs. Her character embodies resilience and optimism, showing how even the youngest member of a family can make a profound difference. Her future aspiration is to become a veterinarian, reflecting her deep love for animals, which is first shown through her attachment to the ladybug Tentomushi. This dream indicates her nurturing nature and desire to care for living creatures, traits that align with her role as a unifying force within her family.