「ひとりにしないで。」 (Don't Leave me Alone) or more formally known as プーチンP第1部 「ひとりにしないで。」 (Putin-P Part 1 "Don't Leave me Alone.") is Putin-P's first album.
It consist of 11 tracks, 9 published songs from the Putin-P Series (only without Ronald's voice) and 2 unpublished songs. The full version of 4 songs ("All Together!", "It's the End!", "I'm Happy!", and "I'll Give you Chocolate!") are also included in the album.
A crossfade can be heard here (nico video) and was first distributed in VOC@LOID M@STER 12.