This program is for small scale 1-2 day-workshops three times a year, aiming to promote discussions and collaborations among domestic researchers in the field of particle cosmology. Broadly speaking, it would cover topics of inflation, baryogenesis, dark matter phenomenology, gravitational waves, cosmological implications of various theories of the beyond the standard model, including some topics of particle physics phenomenology and astroparticle physics. In this first meeting in 2022, there will be introductory lecture about quantum cosmology.