Is the cohabitation life of a 28-year-old office worker and a 17-year-old high school girl going to be full of challenges!? A long-awaited yuri collection for fans! The 28-year-old office worker, Yuu Yoshioka, ends up taking care of her 17-year-old niece, Sachi, who is a second-year high school student. However, she struggles with how to interact with the expressionless and quiet Sachi…!? This collection features the popular web series "It’s Tough Not Knowing What Today’s High School Girls Are Thinking," along with other bittersweet yuri stories such as "The Time I Tried to Blow Up My Company" and "You’ll Understand When You’re an Adult." Additionally, it includes the work that became the origin of "Hokuriku Triangle," titled "The Story of the Hokuriku Shinkansen ~Kagayaki Masshi~." [Included Works] - It’s Tough Not Knowing What Today’s High School Girls Are Thinking - The Time I Thought About Quitting My Job - The Time I Quit My Job - The Time I Tried to Blow Up My Company - You’ll Understand When You’re an Adult - Virgin Road - The Story of the Hokuriku Shinkansen ~Kagayaki Masshi~