Fan-Fiction: The Short Stories of Kotoyama

Shin Takasago is a second-year high school boy who wants to quit kendo despite having the talent for it. A mysterious stranger approaches him and tells him, “Don't tell them you're quitting until tomorrow." (Source: Natalie, translated)

The Hyakki Yako, the night parade of 100 demons, is a chilling festival and one hell of a party! Every demon from around the way wants to go, but only the worthiest will be chosen! Source: VIZ Media Chapter 3 of Kotoyama Tanpenshuu: Fan-Fiction.