Uchi no Shitsuji ga Iukotoniwa 4 (Kadokawa Bunko)

[Machine Translation] Shinichiro, the father who is one or two steps ahead of the rest, and Feng, the family orderly, finally return home... But the two of them saw Hana Ying grow up a little bit, and then they went back to the air for a trip. Hana-ying, who has been decided to remain as the head of the Karasuma family, attends a boat party hosted by the Mehinagawa family, with her calm and faithful butler, Korozuki. There, however, an incident occurs in which a person is pushed overboard. In order to find out who the real culprit is, Hana Ying begins to interview the people involved... A new chapter in the upper class mystery of the half-mature housemates has begun!

一枚も二枚も上手の父・真一郎と家令の鳳がついに帰還...と思ったのも束の間、ふたりは少しだけ成長した花穎の姿を見届け、再び旅の空へ。烏丸家当主残留が決定した花穎は、冷静かつ忠実な執事・衣更月を伴い、因縁ある芽雛川家主催の船上パーティーに出席。ところがそこで、人が海に突き落とされる事件が起こる。真犯人を突き止めるべく、花穎は関係者に聞き込みを開始するが...。半熟主従の上流階級ミステリー、新章スタート!