The camera crew is descending upon Jinbo Elementary, set to film Child\'s Toy on Sana\'s home turf. Already worried by the lack of goodwill and harmony amongst her fellow classmates, the motor-mouth is shocked to discover what happens when the teachers lose their cool. With the students lined up right behind them, it looks to be an all-out war! The excitement picks up as Sana joins forces with two prepubescent leading ladies, forming the sensational singing trio: The Three Teens. Yet harmony proves evasive as discordant personalities send the group off-key. It\'s up to Sana to get in tune, or there could be fireworks literally!