90 seconds to learn about eyestrain and short-sighted

Eye-straining works, such as PC work, cause eye diseases. Learn how to treat your eyes in 90 seconds.
Japanese Learning Course for JLPT N3 Level
Learn letter writing etiquette in Japanese; onchu and sama in 90 sec Learn letter writing etiquette in Japanese; onchu and sama in 90 sec
Learn about the chirping of a cricket (Korogi) in 90 seconds Learn about the chirping of a cricket (Korogi) in 90 seconds
90 seconds to learn Japanese vocabulary - Theme: Date! 90 seconds to learn Japanese vocabulary - Theme: Date!
90 seconds to learn Japanese vocabulary - Electric appliance! 90 seconds to learn Japanese vocabulary - Electric appliance!