Basically the first victim to be killed was Lydia (and since most of the students are children, monokuma said that "she was put to permanent sleep.") and so begins the investigation.

charlie brown: "so... should we talk about our alibis first?"

sally: "that's a good idea big brother! So, during that night I was playing with my dolls as usual."

marcie: "i-i was reading some books.."

peppermint patty: "I was doin' my sports stuff."

Schroeder: "I was doing piano practice, didn't really... Sleep that much, maybe until 4 AM at best." The slight exhaustion clearly showed in the blonde boy's movements.

Sally: "really?"

Schroeder showed Sally his wrists, the others quietly gasp. seeing that his wrists were slightly bruised from constantly playing the piano, but I mean he wasn't the most expressive person in the world, so he didn't really have a problem showing them off, as long as he had a believable alibi.

woodstock: (chirps)

linus: "and I was-"

lucy: "be quiet linus! Let the professional handle this!"

she yelled at her brother, linus looked down and fidgeted with his blanket, lucy smirked before speaking, while Schroeder just walked over to a bookshelf and leaned close to it, checking to see if there was any murder weapons behind, his chest pressed against the shelf, which made him slightly irritated, good grief he hated when that happens...

lucy: "so... Lydia wasn't put to sleep when it was midnight! It was at a different time!"

violet: "A...different time?"

lucy: "how should I know!? You figure it out, blockhead!"

Charlie brown: "good grief.."