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History revolves around the many events in the lives of two students from the Outside World - Maribel Han and Renko Usami. They are the only members of the "Hifuu Club Activity Record" who are looking for those hidden worlds as Gensokyo, the Netherworld and the Moon.
Marisa, an ordinary magician, suspects a youkai is behind the winterly weather in the middle of spring. She goes off to investigate and soon arrives in the netherworld, facing the youkai behind the strange incident. Will her friend, the shrine maiden Reimu, arrive in time to save the day or will all be lost?
It's 1992, and university student Meiko Uehara has just started a part-time job working at a local shop that sells PCs and PC parts. But it turns out that the shop is just a temporary cover, and that it actually primarily operates as a eroge development company that produces dating simulation games! After most of its staff left the company, Meiko is quickly appointed as a substitute graphic artist due to her ability to draw, but she's never drawn anything that would get rated 18+! Will she be able to successfully complete an erotic video game?! With a 16-bit computer at her side, her life as a creator has just begun!
In the Hakurei shrine warehouse the not so helpful, klutzy, Ibuki Suika and shrine maiden Hakurei Reimu are the only ones working on the preparations for the upcoming festival. Suika is then sent off to do the shopping, when Reimu notices the disappearance of the shrine's donation box. Journalist Shameimaru Aya who suddenly shows up, suggests the box may indeed have been stolen - strangely enough since it is always empty. Aya goes into detective mode, quickly summoning mage Kirisame Marisa, who is supposed to help find the missing box. As it turns out many other things have mysteriously disappeared the night before. Much work still lies ahead of Reimu... and who or what is the shadowy figure among the trees near the shrine?