Hi, this scene was implemented in the v0.07, available on subscribestar. Pachi is also aware of this bug and it will be fixed in the next update.
Hi, the outfit was implemented in the v0.07, the latest update available on subscribestar. From there, you have to buy the outfit in the shop, gift it to Mayu by clicking en "gift" when interacting with her and if you have at least 500 desire (half the bar), you can unlock the h-scene.