Used

<<Rakudai Ninja Rantaro>> [Free Distribution Book] The Emperor's Delusion of Sweet Gourd No Dividend / Koaki （All Character） / Emperor 甘瓜

Used

<<Rakudai Ninja Rantaro>> After the Mission / Koaki （Sixth grader） / Emperor 甘瓜

Used

<<Rakudai Ninja Rantaro>> "I want that girl." / Koaki （Bunjiro Shioe, Senzo TACHIBANA, Yashamaru Hirataki, Kihachiro AYABE） / Emperor 甘瓜

Used

<<Rakudai Ninja Rantaro>> Yukinokainani / Koaki （Sixth grader） / Emperor 甘瓜

Used

<<Rakudai Ninja Rantaro>> Kodomotachi wa Yoru no Gomeko / Koaki （Nagatsugu Nakazaike x Kodairita NANAMATSU） / Emperor 甘瓜

<<Rakudai Ninja Rantaro>> Library fairy / Emperor 甘瓜

Used

<<Rakudai Ninja Rantaro>> Today, Rokuro Biyori. / Rubber Sun / Akino （Rokunen Rokgumi） / Six year Class Committee (NEXT)

Used

<<Rakudai Ninja Rantaro>> Furnace / Koaki （Nagatsugu Nakazaike, Koheita NANAMATSU） / Emperor 甘瓜

Used

<<Mr. Osomatsu.>> Monologue to Brothers / Koaki （All Character） / Bitter melon

<<Rakudai Ninja Rantaro>> It's only sweet, such a thing （Nagatsugu Nakazaike × Kodairita NANAMATSU, Kodairita NANAMATSU × Nagatsugu Nakazaike） / Emperor 甘瓜