Natsumi Kawashima, a lively fifth-grader, is fixated on her fantasy of becoming the ideal, sexy woman. Rejected by every cute guy she fawns over, she finally gets a break when she finds a package of mysterious pink nuts labeled for adults only. Consuming these nuts causes her to transform into a voluptuous adult, and she is offered modeling opportunities while suddenly attracting the attention of guys who previously wouldn't have given her the time of day. However, she remains a child inside and is about to learn that things do not always work out exactly as one hopes...