As a note, "サ•コ" is a reference to "サイコ" aka the movie Psycho, since that panel is a redraw of the famous scene where Norman Bates kills Marion Crane in the shower.
Thank you for the translation! The first story was very cute, so it's a shame the second one took such a turn. I know the rest of the second story won't be translated (good riddance lol) but is there any chance you'll translate the volume extra with Kato & Kasahara's friends?