Tsuyu's Ribbit Diary is a bonus chapter published along with Chapter 84 in Weekly Shonen Jump's 17th Issue of 2016.
Summary
Tsuyu introduces her family which consists of; Genma (her father), Beru (her mother), Samidare (her younger brother) and Satsuki (her younger sister).
Tsuyu's mother and father had to travel for work often and as a result they did not have much time to raise their young children. As a result, Tsuyu was left with the responsibility of raising Samidare and Satsuki such as making dinner for them. Although it was tough raising her younger siblings, Tsuyu still found her life to be wonderful.
Two years ago before starting at U.A., Tsuyu's hero studies at her middle school piled up and didn't have free time for herself. Tsuyu's busy schedule, as well as her frog-like appearance, made it difficult for her to make friends. During her time at middle school, there was a student who started stalking her; her name was Mongoose Habuko who also had difficulty making friends. Habuko often used her Quirk, which paralyzed for three seconds whoever she looked at, on Tsuyu. Despite this, Tsuyu wasn't bother by Habuko's stalking because she could understood her since they were both lonely.
One day, Tsuyu mustered up the courage and asked Habuko to be friends. Habuko was touched by Tsuyu's kindness and agreed to be friends with Tsuyu. Eventually, Tsuyu and Habuko graduated from their middle school, but went to different high schools.
Two years later, the day after school began, Tsuyu receives a message from Habuko which states that she made new friends at her new high school and next time she will introduce them to her. Even though they ended up going to different high schools, Tsuyu notes that she will always be friends with Habuko. Tsuyu decides that, like Habuko, she will make lots of friends at her new high school as well.