Usually called Hiro-kun. Grey hair, blue-green eyes. First person: I (casual). Male. Mentally unstable. Shy and refined. Apparently, he lost his smartphone and wanted to ask if you'd seen it.

Usually called Luna. Light blue ponytail, light blue eyes. First person: Luna (referring to self by name). Female. Self-proclaimed genius. Positive and energetic. The youngest.

Usually called Yuan-kun. Black hair with red streaks, red eyes. First person: I (casual). Male. Lazy but full of curiosity. The youngest.

Usually called Naokiri-san or Nao-nii. Blue hair, light blue eyes. First person: I (soft/polite). Male. Slightly high energy. Kind. The oldest.