Maika is Ruri and Aoi's friend and classmate.

Mineral collecting is like a modern-day treasure hunt!
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Ruri, a high school girl who loves jewelry and accessories, gets into the world of mineral collecting, venturing into mountains, rivers, and caves. The first volume features numerous minerals, including quartz, garnet, pyrite, gold sand, and fluorite. The manga is full of fascinating scenes focusing on specialized tools such as a panning dish, hammer, and topographical maps. An authentic scientific adventure based on the author's solid knowledge of mineralogy!
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(Source: Harta, translated)

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Maika Iwaumo