What exactly was Ito Junji's 'Human Head Balon'?

Ito Junji's " Human Head balloon " was a Japanese horror novel about a monster named " balloon man." This monster was a human head monster with a human head balloon. It would use the human head balloon to kidnap humans and suck their blood before putting their heads on the balloon and floating away. The protagonist of the story was a young girl who met this monster at a party. During her conversation with the monster, she learned that the monster used to be a wealthy merchant, but for some indescribable reason, he became a human balloon man. The girl's father had also been kidnapped by a monster at a party and became the target of the balloon man. The girl decided to track down the monster and save her family, but she encountered many difficulties and dangers on her journey. Not only did she have to face the terror of the balloon man, but she also had to fight against many mysterious characters and monsters. In the end, the girl successfully found her family and defeated the balloon man, but the ending of the story was thought-provoking.