Yaku Yakuzen

Meet Yaku, the lovable old loli and proud pensioner who charms everyone with her warm, grandmotherly vibe. She’s Kusuri’s grandma and brings a dose of calm and maturity, all while delighting in the shenanigans of her younger relatives. Yaku has a playful side, often teasing Rentarou, and her confusion with modern tech is both funny and endearing—she calls smartphones "planks"! Growing up in the early 20th century, Yaku's got stories from way back, including her time during World War II when she treated soldiers. And while she met her husband during that era, she keeps those details playfully mysterious.