TH14 has been released so.... what will happen to TH15?
Here are my ideas.
Option 1 : After the cause of Youkai Rebellion, Reimu`s Gohei and Marisa`s Mini-Hakkero is overflowing with darkness so both of them must find the one who can purify their weapons until it turn into tsukumogami, stage 6 boss has the ability to prevent weapons to turn into tsukumogami while extra stage boss is the one who can purify weapons.
Option 2 : Raiko Horikawa is the preview of TH15, her western clothes influence about 90`s musicians, TH15 is about Youkai musician wars.
Reimu was teamed with Lunasa, Marisa was teamed with Lyrica and Sakuya/Sanae was teamed with Merlin.
Option 3 : Someone from Outside world has invaded Gensokyo to find the Moriya group for revenge, because Suwako is a murderer in the past.
Option 4 : Youkai Rebellion isn`t finished yet, a big army of Youkai will avenge Sukuna, Stage 6 boss is the another Oni while extra stage boss is Konngara`s underling.
Option 5 : Armageddon, final touhou game, all youkai from Gensokyo will be killed, Marisa died after defeating the Extra stage boss, Reimu died after defeating the Phantasm stage boss.
that`s what inside my mind, so.... any ideas about speculations for TH15?