A work from 1945, when the composer was 16 years old. Dedicated to Sumiko Fujii.

It has not been published, but the autograph manuscript remains. Furthermore, the score is included in the book Akio Yashiro: The Man and His Works (Ongaku no Tomo Sha, 1979, out of print), which contains five unpublished works, photographic reproductions of the autograph manuscript of the Violin Concerto (posthumous work), critiques, a chronology, and a collection of photographs. At the beginning of the score, it is stated in French: "The first theme of this sonatina is very similar to the first theme of Ravel's Sonatine, but I never imitated it; I wrote it when I was unaware of Ravel's Sonatine."