The "Bagmen Incidents", a series of murders. The perpetrator is the rumored girl clad in a sailor uniform whose face is concealed by a Gas Mask dubbed "Mask-san". One day, by a coincidence, that same Mask-san was seen by the young boy Watta. Furthermore, that face belongs to, of all people, his classmate...!? With the unprecedented heroine, Gas Mask Girl unfolds with suspense in battle and on campus. The curtain rises magnificently!!

Reimu is bored. So she tries to kill time with Marisa as she just happens to be there.

Patchouli decides to go without magic for a day, and visit the human village on foot while at that. But not necessarily by her feet, mind you.

A sweet and yet contains some dark bitter moments Keine x Mokou.

Meiling gets very excited about using love and courage to help Gensokyo, the problem is who she consults with…

Reimu is bothered by Sakuya as she tries to solve the Scarlet Devil's economical crisis.

Reimu needs some help for a big party, and for some reason, it’s humans (and half-ghosts) only.