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Identity: It's a fanmade MSA anime and manhwa.
Background: In the Taisho era, in 1915, a 15-year-old boy named Hayato who was born frail and weak was in his room alone, but despite this, neighborhood children still continues to treat him gently because they understood that his 46-year-old mother named Tsukiko and older sister named Fuyu who is 15 years older than him who is 26 is a beautiful-looking woman with dark-brown hair a fringe hanging on the right side and pink eyes whose hair is short wavy hair were heartbroken after the doctor solemnly told them that there was nothing they could do and he will remain that way and since that day, he was confined in the house of the Ishikawa family he was born in 15 years ago and he even learned how to read and write not long after his father died before Hayato was even born. However, one snowy night, while his mother Tsukiko and Ayane are away, a man named Muzan Kibutsuji who already watched them when they saw the blue spider lily who saw him and begged him to save her brother Hayato saw him in his own futon alone. Ayane loves her little brother Hayato so much more than anything else in the world. What happens next?