The purpose of the Nihongo Sogo Enshu series is to organize and explain grammar in an easy-to-understand manner and have the learner practice how to use it, thereby ensuring he/she uses advanced-level Japanese appropriately. The learner follows a process of discovering a grammar rule while solving a problem, and then confirming the usage through practice. Finally, the learner does comprehensive practice as a summary of what has been learnt.

This book in the series focuses on particles, particularly 'wa' and 'ga', complex case particles and adverbial particles, all of which even advanced students of Japanese can find difficult. The book not only explains the grammar necessary for particle usage, but also assists the user in thinking of the relevant rules when using particles. First of all, via the given examples, the user becomes aware of problem areas related to the relevant particle. Next, he/she elicits the specific grammar rules and then confirms them while reading the examples. Finally, he/she practices using practical examples.