Ririumu is an elf girl from another world who is the first local that Kōzō Yukawa encounters after his arrival; her initial misunderstanding leads to conflict, but she soon realizes the visitors mean no harm and even joins them in the hot springs.
Ririumu belongs to the elf tribe in a fantasy world and is often guided by myths and traditions passed down among elves.
She initially believes the hot springs—mistakenly called the "Fountain of Death"—are dangerous and cursed, based on old elf superstitions.
When she first spots Kōzō Yukawa and his companions enjoying the hot springs, she assumes they are in grave danger and attempts to intervene forcefully.
After observing their harmless bathing and learning more about them, Ririumu overcomes her fears.
She decides to join Kōzō and the others in the hot spring, realizing the waters are pleasant and safe.
Her attitude quickly softens once she understands that the visitors from another world have no ill intentions.
Ririumu's older sister, Ōhendeku, is the leader of their elven tribe.
Ririumu's curiosity and open-mindedness play a key role in bridging the gap between the two worlds.
Ririumu is voiced by Ria Koito.
Ririumu’s actions exemplify her growth from following tradition blindly to thinking for herself.
Her willingness to trust Kōzō and embrace new experiences hints at bigger changes to come for her tribe.
Her relationship with her elder sister, the tribal leader, adds a layer of family dynamics to her story.
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