Labrune (2014) argues that Japanese /r/ is structurally empty. This reply points out that the phonological characteristics of /r/ which are discussed by Labrune (2014) come with many systematic exceptions, and hence they are better modeled by violable constraints. To illustrate how violable constraints accommodate such systematic exceptions, alternative analyses based on Optimality Theory (Prince & Smolensky, 2004) are presented. This reply also points out that the three constraints on /r/ that are discussed by Labrune (2014) are in fact not specific to /r/, and therefore, motivating structural emptiness based on these patterns would face a problem of not being able to distinguish /r/ from other segments. Based on these considerations, this reply concludes that /r/ (and other segments) in Japanese should have segmental contents.Keywords: phonology, Japanese, /r/ 1 Introduction Labrune (2014) argues that Japanese /r/ is "phonologically empty" (p. 1). Building on previous studies making use of the Underspefication Theory (e.g. Mester & Ito 1989), Labrune (2014) says that /r/ is "totally featureless at the abstract level" (p.14). This reply article reexamines some of the evidence that is discussed in Labrune (2014), and shows that the behavior of /r/ actually shows that it has features.¹ In particular, this paper argues that the phonological characteristics of /r/ which are discussed by Labrune (2014) come with many systematic exceptions, and hence should instead be modelled by using violable constraints. To provide explicit accounts of the behavior of /r/ using violable constraints, alternative analyses in terms of Optimality Theory (Prince & Smolensky, 2004) are presented.² In addition, this reply also points out that the three constraints on /r/ that are discussed by Labrune (2014) are in fact not specific to /r/, and therefore, motivating structural emptiness based on these patterns would face a problem of not being able to distinguish /r/ from other segments. Based on these considerations, *Corresponding Author: Shigeto Kawahara: Keio University, Tokyo, Japan; Email: kawahara.research@gmail.com 1 Although some pieces of evidence in Labrune (2014) come from patterns of Old Japanese and historical developments of /r/, Labrune (2014) makes it explicit that the same argument holds for Modern Japanese-that Japanese /r/ is synchronically structurally empty (p.2). The current reply is exclusively about the synchronic phonology of Modern Japanese, and has nothing to say about the diachronic nature of /r/. Pellard (2014) develops an extensive critique on the diachronic claims made by Labrune (2014); readers who are interested in diachronic claims of Labrune (2014) are referred to that work. 2 Despite the fact that Labrune (2014) argues that /r/ is phonologically empty, the same paper develops an Optimality Theoretic analysis to derive /r/ to break up vowel sequences (pp. 16-21). This analysis assumes that /r/ is featurally-specified, because it uses feature-agreement constraints, which would not be computable...