Karibe Seiichiro (played by Ryohei Suzuki) is a talented girl cartoonist who has created many outstanding girl comics that make readers' hearts beat. However, hiding behind his pen name, he tried his best to conceal his true identity. His emotional experience and life trajectory are a huge mystery to readers. Seiichiro never hired an assistant and has always lived a single-handed life. One day, a child named Jun walked into Seiichiro's life, and his existence completely changed Seiichiro's world. Kuon Aiko (played by Riho Yoshioka) is an employee of a funeral company. What she didn't expect was that one day, she would go to organize the funeral of her first love. By chance, Aiko and Seiichiro met, and Aiko became Seiichiro's "love investigator". Under Seiichiro's instructions, she experienced various love experiences, collected intelligence, and provided it to Seiichiro for creation.