Onii-chan... You're getting sloppy again.

Actually...

When Onii-chan was a guy, it was tiny.

And now that he's a girl, it's gotten large.

Then...

If I pull it out while he's a girl... * An idea of a terrifying big sister, or should I say mad scientist, who remembers her big brother's (little sister's) ahoge and wants to pull it out

Mihari-chan, in the age where she wants to try out anything that gets her interest

Poor Mahiro-chan, ignorant of what's about to happen

Will it end the drug's effect and turn him back into a boy?

Or will he grow a thingy while remaining a girl?

? Mihari?

What are you...