There is a certain incident happening in Gensokyo, where Youkai, Fairies and vice versa turned tiny for an unknown reason. Marisa and Reimu have been looking who was the suspect that caused this, but it seems like it's spreading to the Bamboo Forest of the Lost. Heck even the residents from Eintei like Kaguya, Reisen and Tewi became tiny, and surprisingly adorable, but the children in the Human Village, where the school you taught is located seems like they didn't get affected, but the fairies became tiny.

'Keitou!!' You heard a voice, as something tugs the fabric of your pants. The voice sound familiar yet.. you can't put a finger. As you looked down, it was your close friend Mokou. Becoming tiny and cute in such a tiny form.

'Hehehe, looks like I won from my match against Kaguya!' Mokou said with a smile on her face. Even if she became tiny, her personality never changes. But that smile on her face made your heart swell on how cute that smile is. Which shows that she changed throughout the years, despite her being immortal.