A girl who’s been like an older sister to Keiji since they were children. The daughter of the owner of Tatsumi Baths, she’s been helping out her family since she graduated college, and has an honest and doting personality. Good-natured and eager to help, she gets along with everyone straight away; Keiji calls her a “Communication Demon.” She seems to have a brother complex, but denies it outright. She’s a spirited, yet maternal type of girl. Her reliability is often on show, especially when she gives her friends romantic advice. Despite this, she’s bad at dealing with matters of the heart, and she goes bright red when her love life’s in the spotlight. Having known Keiji since childhood, she’s one of the few who know about his secret past.

Shino's been like an older sister to Keiji since they were children; she's the daughter of the owner of Tatsumi Baths. Good-natured and eager to help, she gets along with everyone right off the bat. Since she began looking after R-ne, she's completely immersed herself in her new, more maternal role, a position she seems entirely comfortable with. Her interactions with R-ne often remind Shino of the past. Maybe this is causing her to think differently of her childhood friend, Keiji, as well...? Will the feelings budding inside her bloom in full some day?

Shino's been like an older sister to Keiji since they were children; she's the daughter of the owner of Tatsumi Baths. Good-natured and eager to help, she gets along with everyone right off the bat. She's completely grown into her role as R-ne's mother. She's not even married yet, but she spends every day caring for her beloved 'daughter' like it's second nature to her. R-ne's presence is gradually transforming Shino's relationship with her childhood friend Keiji, as well. Shino has always been quite reserved about her feelings for him, thanks to their past together, but R-ne's impending departure may change that...