Ending Themes:
#01: "Uta wo Utaou" by Daiji-Man Brothers Band
#02: "Sunao ni Naritai" by Hiromi Yonemura
#03: "Do-shite" by Sakurakko Club - Sakura-kumi
#04: "Reggae" by Kotone
#05: "Party Join Us Daisakusen" by Maron Koushaku & Akiko Yajima
#06: "Shin-Chan Ondo" by Haruo Minami & Akiko Yajima
#07: "Boys Be Brave ~Shounen yo Yuuki wo Mote~" by Aki Okui
#08: "Tsukiakari Funwari Ochitekuru Yoru" by Nanami Ogawa
#09: "Suki Suki - My Girl" by L'luvia
#10: "Ora WA Ninkimono" by Akiko Yajima, Keiji Fujiwara & Miki Narahashi
#11: "Sayonara Arigatou" by Sachiko Kobayashi
#12: "Kyou WA Date" by Kamaboko
#13: "Genki de Ite ne" by Sachiko Kobayashi
#14: "Zentaiteki ni Daisuki Desu." by Sheki-Dol
#15: "Nichuu no Fantasy ~Taiiku wo Yasumi Onna no Ko Hen~" by Dance Man
#16: "Mama to no O-yakusoku Joukou no Uta" by Akiko Yajima & Miki Narahashi
#17: "Konna Toki ni Koso Yakiniku ga Aru" by the Nohara Family All Stars
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You will find shin Chan episodes in hangama channel.
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Brass monkey
The song Ryuubi sang near the end of episode 12 of Shin Koihime Musou is not the same song as the one that was in the beginning of the episode. The song she sang was the first song that the Chou sisters ever sang. I have tried to find out what it is called , but I ended up wasting my whole afternoon.
That would be "Bicycle".