Hakone is introduced to Haruna's younger sister Aki. She won't believe Hakone is a hot spring fairy, so she proved it by improving the hot spring's water. Hakone gets weakened in the process. Later, she gets treated to some steamed buns, and is amazed that TÅya's family is producing them by the thousands. She also used her secret puzzle box to make Haruna fall for TÅya, but the effect is temporary due to her diminished powers.