We report on the time-resolved CCD photometry of a newly discovered variable star , TSS J022216.4+412259.9 during the outburst in 2005 November-December brightening .
The obtained light curves unambiguously showed 0.2-0.3 mag modulations , which we confirmed to be the superhump observed among SU UMa-type dwarf novae .
We also performed a period search for the data obtained during the outburst plateau phase , and revealed the existence of the two periodicities : 0.054868 ( 98 ) days for the first two nights and 0.055544 ( 26 ) days for the following plateau phase .
This bi-periodicity is hardly observed in usual SU UMa-type dwarf novae , but characteristic of WZ Sge-type stars .
We undoubtedly detected a rebrightening in the post-outburst stage , which is typical of short-period SU UMa-type dwarf novae including WZ Sge-type stars .
These observations suggests that TSS J022216.4+412259.9 may be a new WZ Sge stars breaking the shortest superhump period of 0.05648 days for V592 Her among this class with a known superhump period so far .