On 1, April, 1948 it was renamed Nagano Prefectural Matsumoto Agatagaoka High School.

The music is by Kiyoshi Nobutoki, with lyrics by Tatsuyuki Takano [ja].

Clubs include brass band, music (chorus), light music, drama, art, newspaper, pictures, physics, Earth science, creature, home economics, dance, English (debate), literature, tea ceremony, calligraphy, shogi, comic, volunteer, digital art, card, and Japanese flower arrangement (生け花, ikebana).

During that time, students enjoy eating foods, listening to announcements from the cultural clubs, and participate in the relay.

Many famous people have graduated from Matsumoto Agatagaoka High School, including lawyers, university professors, athletes, singers, and actors.

These include film director Takashi Yamazaki, who directed Always: Sunset on Third Street and Eternal Zero.