Seishun Manmannaka! (青春まんまんなか！；Fully in Youth) is the debut indies single by Tsubaki Factory. It was released on September 6, 2015 being sold at the Hello Pro Kenshuusei Happyoukai 2015 ~9gatsu no Nama Tamago Show!~.
- Seishun Manmannaka! (First Take)
- Seishun Manmannaka! (Instrumental)
- Lyrics: Mori Chiyoko
- Composition: KOUGA
- Arrangement: CMJK
- Dance Choreographer: YOSHIKO
- Music Video: Takehisa Masaki
- Hello! Project 2015 SUMMER
- Hello Pro Kenshuusei Happyoukai 2015 ~9gatsu no Nama Tamago Show!~
- Hello! Project New Fes! II
- ANGERME First Concert Tour 2015 Aki "Hyakka Ryouran"
- Hello! Project COUNTDOWN PARTY 2015 ~GOOD BYE & HELLO!~
- Hello! Project 2016 WINTER ~DANCING! SINGING! EXCITING!~
- Hello! Project Kenshuusei Happyoukai 2016 2gatsu・3gatsu ~SINGING!~
- Morning Musume '16 Concert Tour Haru ~EMOTION IN MOTION~
- Hello! Project 2016 SUMMER ~Rainbow Carnival~
- Hello! Project COUNTDOWN PARTY 2016 ~GOOD BYE & HELLO!~
- Hello! Project 2017 WINTER ~Kaleidoscope~ (as part of a medley)
- Hello! Project Kenshuusei Happyoukai 2017 6gatsu ~June Tripper!~
- Tsubaki Factory Live Tour 2018 Haru "Hatsukoi"
- Tsubaki Factory Live Tour 2019 Aki: Gekkou
- Tsubaki Factory Live Tour 2020 Haru Tsubaki
- The single was announced on August 8, 2015, during the Hello! Project 2015 SUMMER concert.
- A music video (non-live version) of the song was released as part of the DVD mini album Tsubaki Factory SOUND + VISION Vol.1 on May 18, 2016.
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