Your Diary+ presents a unique journey through the intricacies of human emotions. This is a visual novel that explores the countless ways people can find happiness, told through the stories of seven charming heroines. Embark on this narrative adventure to discover the essence of everyday joys that often go unnoticed. The exploration of happiness is central to the stories of the seven heroines. Each character's narrative path revolves around a certain facet of happiness. The main character, Nagamine Tomoki, is a second year student at Kazamizaka Academy. Due to his parents being overseas, he lives with his childhood friend Minagawa Yuhi. Tomoki leads a peaceful student life, contributing to the library committee and helping out after classes at the Yuugaotei family cafe.

The following heroes are presented:

• Yua: Discover the happiness of being truly useful to someone.
• Sayuki: Experience the satisfaction of knowing that another person needs you.
• Juhi: Immerse yourself in the warmth of someone's deep love.
• Kanade: Enjoy the praise and recognition of others.
• Kaho: Explore the complexities of falling in love with someone.
• Natsuki: Go on a romantic trip with your loved one.
• Hotori: Learn the importance of trusting another person.