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We present optical, near-infrared, and radio observations of supernova (SN)SN~IIb 2022crv. We show that it retained a very thin H envelope andtransitioned from a SN~IIb to a SN~Ib; prominent H$\alpha$ seen in thepre-maximum phase diminishes toward the post-maximum phase, while He {\sc i}lines show increasing strength. \texttt{SYNAPPS} modeling of the early spectraof SN~2022crv suggests that the absorption feature at 6200\,\AA\ is explainedby a substantial contribution of H$\alpha$ together with Si {\sc ii}, as isalso supported by the velocity evolution of H$\alpha$. The light-curveevolution is consistent with the canonical stripped-envelope supernova subclassbut among the slowest. The light curve lacks the initial cooling phase andshows a bright main peak (peak M$_{V}$=$-$17.82$\pm$0.17 mag), mostly driven byradioactive decay of $\rm^{56}$Ni. The light-curve analysis suggests a thinouter H envelope ($M_{\rm env} \sim$0.05 M$_{\odot}$) and a compact progenitor(R$_{\rm env}$ $\sim$3 R$_{\odot}$). An interaction-powered synchrotronself-absorption (SSA) model can reproduce the radio light curves with a meanshock velocity of 0.1c. The mass-loss rate is estimated to be in the range of(1.9$-$2.8) $\times$ 10$^{-5}$ M$_{\odot}$ yr$^{-1}$ for an assumed windvelocity of 1000 km s$^{-1}$, which is on the high end in comparison with othercompact SNe~IIb/Ib. SN~2022crv fills a previously unoccupied parameter space ofa very compact progenitor, representing a beautiful continuity between thecompact and extended progenitor scenario of SNe~IIb/Ib.

Bridging between type IIb and Ib supernovae: SN IIb 2022crv with a very thin Hydrogen envelope