Mamiya Rina

Mamiya Rina sports short pink hair, though in the live-action adaptation, her hair is long.

She is described as having a striking figure and a fashionable, attractive appearance.

Her overall style and clothing vary depending on her occupation and the story's progression.

At first glance, Mamiya Rina appears to be a gentle and friendly older sister type.

Beneath her attractive exterior, she is manipulative, ruthless, and willing to go to extreme lengths for financial gain.

She is clever, resourceful, and able to act sweet to gain the trust and sympathy of others.

Though often painted as irredeemably cruel, later adaptations show a softer, regretful side shaped by hardship.

Birthday: July 31

Blood Type: B

Real Name: Mamiya Ritsuko

The name "Rina" is her hostess pseudonym, used while working at a Sonozaki group establishment.

She grew up in a single-parent home and endured a troubled childhood after her mother disappeared with a customer, leaving her father behind with debt and financial ruin.

Her early experiences led her to equate happiness with money, eventually driving her into water trade work and criminal activities.

Mamiya Rina excels at acting and manipulation, able to take advantage of vulnerable or trusting individuals.

She is skilled at exploiting relationships for financial gain, targeting wealthy men and plotting elaborate schemes.

Her ability to maintain her composure and deceive those around her enables her to become a key trigger in various storylines.

She is intimately connected to Ryuuguu Rena's family, aiming to marry Rena's father for financial reasons.

Rina becomes the lover and co-conspirator of Houjou Teppei, and together, they orchestrate fraudulent schemes.

She has multiple lovers and is entangled in the Sonozaki group's world, sometimes attempting theft and double-crossing even her partners.

Her complicated connection with Ryuuguu Rena, marked by deception and eventual violence, is central to her character arc.

Other notable relationships include interactions with Sonozaki Mion and members of the main cast as her actions shake the community.

In When They Cry: Sotsu, Mamiya Rina's personality is depicted with notable improvements, showing empathy rooted in her past.

Her signature "deep-sea fish" nickname, coined by Rika Furude, represents bad luck and foreshadows tragedy wherever she appears.

Her attempts to steal from the Sonozaki group always end in failure and likely result in deadly consequences from Sonozaki Mion's family.

"I really love Rena's father—honestly."

"I just wanted a happy life, but money is always the problem."

Role in “Tsumihoroboshi” Chapter

Mamiya Rina appears as Ryuuguu Rena's father's romantic interest, intending to marry him for financial benefit.

After winning the trust of Rena's father, she tries to manipulate Rena into accepting her, only to reveal her true intentions when confronted.

Rena realizes Rina's lies, leading to a violent confrontation where Rina attempts to silence Rena permanently.

Ultimately, Rina is killed by Rena after a struggle, and her body is disposed of with help from Maebara Keiichi and Sonozaki Mion.

Role in “Tatari-goroshi” and “Minagoroshi” Chapters

She appears posthumously as a murder victim, driving the stories' tragedies and the outbreak of the Hinamizawa Syndrome in the cast.

Her involvement with Houjou Teppei triggers dark consequences for multiple characters.

Role in “Matsuribayashi” and “Sotsu”

Mamiya Rina survives in certain storylines or is portrayed with more depth, showing remorse and making efforts to change her life.

She ultimately decides to leave the water trade and move toward a positive, normal future, shedding her destructive tendencies.

When They Cry: Meguri Storyline

Detailed background is provided; her relationship with Rena parallels her own unhappy childhood.

She and Rena reach mutual understanding and part ways peacefully, revealing Rina as a tragic figure seeking happiness.

Overall Story Impact

Whether alive or dead, her presence catalyzes major events—spreading misfortune and becoming a symbol of tragedy and unresolved ambition.

Though originally depicted as a villain, she is later reexamined as a deeply wounded individual shaped by hardship and craving genuine happiness.

Her death and subsequent disposal recur as traumatic, unresolved events for Ryuuguu Rena and the club members.

In alternate paths, Mamiya Rina sheds her criminal ways and achieves a modest happiness, serving as a symbol of redemption possible even for the most troubled characters.

Throughout the series, Mamiya Rina transitions from a manipulative antagonist to a complex, sympathetic figure whose fate often depends on the choices of those around her.