This is the insignia of the military Youth Association (also translated as the Patriotic Youth Brigade). The cloth
badge is below. It is the first kanji in the phrase. This kanji means both 'blue' and 'youth'.
Founded in 1915 by the Army,  The Patriotic Youth Brigade consisted of boys who had been graduated from
elementary school but who were not old enough to join the service. In 1926 4-year military training facilities were
made for these boys.
Patriotic Youth Brigade
During the war years, which extend from 1894 to 1945, there was a bewildering number of
quasi-military groups, each of which had membership badges and commemorative items.
The largest of them appears to have been the Patriotic Youth Brigade.
Here are the kanji for the Youth Association: SEI-NEN KAI. This is often
abbreviated (as seen above in the cherry blossom cup and in the flag)
using just the first kanji.

Below is a 3-cup set awarded by the Youth Association.
Here are two cups awarded by the Youth Association. The inscriptions are interesting. In blue around the rims it reads, 'Rise of Asia,
Youth Association, Labor for the Good of the Country Group, Commemorative.' In the bowls are different phrases;  the one on the left is
very famous: HAKKO ICHIU or 'The 8 corners of the World under One Roof,' often interpreted as Japan's urge for world domination. The
one on the right is not as famous but still interesting: 'TENGYOU TSUISHIN or 'Make Progress, Work for the Emperor.'

In the rush to colonize Manchuria, peasants and other youths were given KOA KYUIKU (Rise of Asia Education). They were first
schooled at training centers (used from 1937-40) for 2 months, and then had a week of this Rise of Asia education. Then they were
enlisted in the Youth Association and most often shipped off to Manchuria to farm there and establish a large Japanese population.

These cups appear to have been awarded after such a training, though I am sure not every student got these.
Inscribed 'Discharge Commemorative, West Division,
Nishijin Town Patriotic Youth Brigade.'
Two Imperial Ho-o birds and the kanji for the Patriotic
Youth Brigade. Inscribed 'Invitation to Join the Patriotic
Youth Brigade. 6th Unit Division.'
Patriotic Youth Brigade flag, circa 1920s or 1930s
Very rare and historically interesting tokkuri from the Patriotic Youth Brigade. Youths were educated
in agriculture and other skills, then they were shipped off to Manchuria to develop those skills and
the country, all for the greater glory of Imperial Japan, of course. This bottle not only has the
Manchukuo flag (1932 to 1945), but it also has the Patriotic Youth Brigade insignia above. And the
central pattern on the reverse (obverse?) has a sickle and rice, obviously an agricultural symbol.

The inscription uses the Kang Teh era name, which is the name of Pu Yi's reign. Rare to see this
dating on cups or bottles, so this could have been made in Manchuria.

Inscribed 'Kang Teh 6 [1939], Rise of Asia Youth Group, Work to Support the Country Unit'.
Also on the side this is written: 'The First Warriors to Cross the Northern Seas.' And a name: 'Saeki.'
Inscribed 'Patriotic Youth Brigade, Draft Commemorative,