十割生そば須厨 ZUZU SHINJUKU gluten-free SOBA

The venue's name includes 'gluten-free SOBA' and '100% buckwheat soba' (juwari soba), and its Instagram profile name uses 'juwari' (meaning 100% buckwheat and inherently gluten-free). The Google Places listing confirms it is a physical restaurant in Shinjuku, Tokyo. No formal accreditation is cited. The structural fact of serving only 100% buckwheat soba, which is naturally gluten-free, combined with branding as 'gluten-free SOBA', strongly suggests a dedicated gluten-free kitchen or at minimum a menu built entirely around gluten-free ingredients. Without explicit confirmation of a dedicated kitchen or accreditation, and given the limited direct evidence about kitchen practices, a conservative Tier A is assigned based on the venue's core identity as a 100% buckwheat soba specialist.