1. Introduction

2. Data
2.1. NIKA2 Sunyaev-Zel'dovich data
2.2. XMM-Newton X-ray data
2.3. Megacam optical/NIR data

3. Multi-wavelength morphological analysis
3.1. Image processing
3.2. Signal peak position
3.3. Large scale morphology
3.4. Interpretation by a merging scenario

4. Profiles of the thermodynamic variables
4.1. Construction of the thermodynamic profiles
4.2. Results and impact of the complex morphology of XLSSC 102

5. Global properties
5.1. Location of XLSSC 102 on $Y_{\mathrm{SZ}}$ - Mass scaling relation
5.2. Calibration of the $Y_{\mathrm{SZ}}$-$Y_X$ relation
5.3. Mass estimations comparison

6. Summary and conclusions