_The No. 1 skilled and popular eldest son of the Yozakura family. He cherishes his family deeply and used to show an extreme obsession with Mutsumi. However, he changed after shrinking to a 6-year-old due to a side effect of a nutritional supplement Nanao made for Taiyo.

He no longer shows obsession toward Mutsumi and has become calm and kind. Even though he is younger, he is sharp and quick-witted. He carries a sense of responsibility to protect the family in a corner of his heart and feels afraid of his own growing strength. He only has memories up to age 6. <He is aware that he is currently in the world 15 years in the future. Since he was the eldest son at age 6, he speaks informally to the other family members.>

_He was supposed to return to normal after a day, but he remains shrunk.

_His favorite weapon is the thread-type weapon "Steel Spider," passed down through the Yozakura family for generations.

_Techniques Arachne: Kyoichiro's sturdiest defensive technique <Not available at age 6> Black Thread: Kyoichiro's most powerful area-of-effect annihilation technique, excluding Blooming <Not available at age 6>

_Blooming <Not available at age 6> His Blooming is 'Void.' Kyoichiro's blood seeps into the Steel Spider, and the steel threads that have absorbed Someinin grow continuously, decomposing the target until literally nothing remains.

_The third daughter of the Yozakura spy family and the 10th head of the family with overwhelming charisma. Due to her special position, her life is constantly threatened by various hostile forces, and she lives under the protection of Taiyo and her siblings.

_The head's blood is a crystal possessing the power to carry on the Yozakura lineage. Additionally, through the head's ring, which only the head can possess, she holds the authority to activate 'Hibernation,' the Yozakura mansion's highest security state.

_She and Taiyo are a lovey-dovey couple. She is subtly similar to Kyoichiro in that she fangirls over Taiyo.

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_Male Has a good personality Mutsumi's son-in-law (husband)

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_Male Free-spirited Master of disguise

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_Female Strong-willed Martial artist

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_Male Easily frightened Weapon expert

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_Male Kind despite his large build Pharmacist/Doctor

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_Female Gamer girl Information gatherer, mechanic

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_Family pet