Since 'ryoushin' means parents and'shakkin' means debt in Japanese, the 'ryoushin no shakkin novel' might be a story that revolves around the financial debts or obligations of parents. It could explore how these debts impact the family, relationships, or the future of the children. Maybe it shows the struggles of a family dealing with parental debts, like how they manage to pay it off, or the emotional turmoil it causes within the family unit.
The combination of the angel's purity and the devil's allure in a love story is what makes it so appealing. It explores themes of forbidden love and defying expectations, which draws readers in and keeps them hooked.
To create a personalized caricature couple, you need to have good drawing skills and a sense of humor. Focus on the couple's most distinctive features, like their hairstyles or smiles. Play around with proportions and add some background elements to make the picture more interesting.