I'm not sure specifically as I haven't read it. It could be about a journey towards happiness, with characters experiencing various events that lead them to find their own form of happiness.
I'm sorry, but without really knowing the content of 'kondo koso shiawase ni narimasu light novel', it's difficult to recommend similar ones. However, some popular light novels with themes of self - discovery and achieving a positive state like 'My Youth Romantic Comedy Is Wrong, As I Expected' could potentially have some similarities in terms of character growth.
Well, from what I know, identity is a big theme. The protagonist's change to having twintails is not just a physical change but also affects their sense of identity. Also, the theme of acceptance might be there. Accepting this new form and the consequences that come with it in the story world. And there's probably a theme of humor as well, given the rather unique concept of the light novel.
Well, it might have unique characters. Maybe the storylines are centered around the concept of a guy becoming a twintail, which can lead to some really interesting and comical situations.
The light novel might have engaging characters. They could be well - developed with distinct personalities. For example, the protagonist's journey of becoming a twintail might involve interacting with other characters who either support or oppose this transformation, creating various story arcs.
One similar light novel could be 'KonoSuba: God's Blessing on this Wonderful World!'. It also has a unique and comical story with interesting characters in a fantasy setting. Another option is 'Overlord'. It shares the aspect of having a protagonist in a different kind of world with their own special abilities and circumstances.
Marie Kondo's success story is remarkable. Her idea of decluttering by asking if an item sparks joy has caught on globally. She first gained popularity through her books, like 'The Life - Changing Magic of Tidying Up'. Her success led to her having her own TV show. In the show, she would visit people's homes and help them transform their cluttered spaces into organized and calming environments. This not only changed the lives of those she directly helped but also influenced a vast audience who then adopted her methods.
To find out who the author of the 'Kondo graphic novel' is, one could try searching for it in graphic novel databases, asking in specialized bookstores or libraries, or looking for reviews and mentions of the novel online. It's possible that it was self - published by an independent author, or it could be part of a larger publishing house's catalog.