Moon Observatory Iris is Untested on macOS
Moon Observatory Iris has not yet been tested on macOS.
About Moon Observatory Iris
Iris works as a Purifier, a person who helps souls of the deceased move on to the afterlife. Her fate changes after coming into contact with the Magicians, half-immortal beings who watch over the MO worlds. Interacting with them, the mystery of the MO worlds' origins will come to light.
Don't be deceived by the lighthearted parts--despite the fun fantasy setting, MO isn't a world that will let you survive with something as flimsy as "the power of friendship."
This is a story written to make you both laugh and cry. At the very least, it has a lot of puns and glasses jokes. This game has a 75% "made me cry" rate, according to the survey.
✦ Characters ✦

Iris: The heroine. A gentle, awkward, and surprisingly brave girl who tries her best.
Rieffe: Iris' kind but detached childhood friend who always worries about her.
Lanneis: A strict and sarcastic person who glares and pushes up his glasses way too often.
Reqieu: Used to be Iris' teacher. Serious, but gentle and low-key sarcastic.
Septem: A serious, kind, and dutiful boy who likes flowers. He's kind of shy once you talk to him. Always polite.

✦ Warnings: light/moderate blood, themes of death
✦ Standalone game but with references to the other Magical Otoge games (Ciel, Anholly)
✦ Stretch goal bonus routes added for free after purchase milestones (details in the Google Form after purchasing the game)
This game is a straightforward visual novel, so there's no walkthrough necessary. It will be very obvious when a choice will affect the ending. After clearing the game once, a guide will appear in the Extras that explains how to get the Good/Bad Ends.

macOS Game Tests
Moon Observatory Iris tested on macOS.
Moon Observatory Iris was released natively on macOS, though it may not run on newer versions of macOS.
Moon Observatory Iris hasn't been tested yet on macOS.