Joosama ni Sasagu Kusuriyubi (2023)

Haneda Riku, a 20-year-old university student who aspires to be a novelist, is bewildered by the sudden marriage of his older sister Ayaka, but then he finds a flyer for a “New Writer Discovery Contest.” The grand prize is 1 million yen! He quickly decides to take on the challenge, but the theme is “love,” something Riku lacks experience in. So Riku consults his friend Mochizuki Rei, who is reputed to be the most popular guy at school, and on Rei’s recommendation, he signs up for a matching app.