Searching for My Perfect Brother Vol. 4 (Kodansha, 2024)

After learning the full truth about her brother, Rize decides to forgive Kairi...but she still keeps from him that she is Masaki's sister. Unbeknownst to her, Kairi has finally put it all together, and disappears into the night after leaving her a farewell note. Desperate to find him, she follows what she hopes are his bike tracks in the snow, praying they won't be covered up by the intensifying blizzard. Meanwhile, detective Tachibana comes to the realization that Rize has been lying to him…