Touhou Makura Shikyou
東方枕紫境
Main character is summoned to the Touhou world via a summoning ceremony by a girl Patchouli who is in trouble with a vast collection of books. Protagonist helps her arrange the books, but not only that.
[From vndbreview]
[From vndbreview]
Contains data from VNDB, available under the Open Database License. Reading difficulty and script measurements come from jiten.moe. Statistics are based on daily data dumps and may not reflect real-time changes.