New graded reading collection Taishukan Japanese Graded Readers.
Every book includes four to seven stories or texts that progressively increase the level of difficulty and length.
This is the fourth volume. It corresponds to a level 4. (Level 3-2 of the JLPT)
Each text is read out by a different voice which undoubtedly helps improve the student’s listening comprehension skills.
You will find the audios and some content samples in the links.
In the above image, you can look up the different levels.
Contents of volume 4:
Level 4 - Intermediate
・vol.4-2 女王 卑弥呼