Fourth book in the Sokuochi Heroines series by Amanedou, and a fine entry in the sokuochi genre. Of course that while falling in a single panel is the strong point of this work and series, the way many characters appear across different works is the strong point of this author. Which is why I want to translate a few more of these. Maybe the direct sequel? There's also the series about the magical girl that can go back in time, or the nani ka ga okashii series is also good. Point is, the more you read Amanedou, the better it is.