The purpose of this research is to know the meaning from yatto and kekkyoku therefore we could know their level of similarity in sentences. This research only focused on grammatical process that affect in these adverbs so that we could found their each meaning and nuance. The result of this research is to be informed and Japanese beginner student could understand the difference nor similarity so that no more mistake in using these. The method of this research is qualitative descriptive for data analaysis and then explain data as detail as possible to achive most proper result. Data are collected from printed media and internet like, Arajin to Mahou no Rampu, Nihon no Mukashi Hanashi, Tokimeki Gohan, ind.nihongodecarenavi.jp, omakakahito.blogspot.co.id, dan yourei.jp. The collected data are 32 data which contain 22 data about yatto and 10 data about kekkyoku. Based on data the analysis’ result, basically yatto and kekkyoku were shared same meaning ‘akhirnya’ in Indonesian so that they can substitute each other. But if the nuances are contradictive or when the main meaning of the sentence was become different while substituted, that is no longer similarity for sure.