Takes place a few years after the ending of Yumeguri Yurimeguri and focus on the Valentine's Day between Nagi and Yuuka.
 
Note: Released at COMITIA 151.

Tsubaki starts off her brand-new high school life the right way—by visiting an onsen! In the bath, she has a chance encounter with a beautiful black-haired goddess. 
"Won't you come to an onsen with me?" Pursuing her with fervor, is it possible to have a relationship with someone before you even become friends? This is the story of two girls who love the onsen and the ups-and-downs of their hot spring days.
 
Note: Chapter count includes 4 extras.

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