"It's not a date if it's not sweet and sour! This is the fifth installment of Ginkuru's "Seishun x Seasonal Love Song. Ginkle wrote the lyrics, composed the music, produced the music video, and produced this addictive pop song based on the theme of the "date theory," which says that a date is only a date if you feel sweet and sour after you go and return home. Produce, Lyrics, Composition, Video, Vocaloid Articulation: Ginkuru Vocal : Miku Hatsune Illustration : ZUMI Keyboard Arrangement : Kei Aota Guitar Arrangement : Tamaisu Bass Arrangement : Nagine Hayababi Drums Programming & Choruswork : Blob Mixing & Mastering & SE Programming : Shoten Pre/Post CM Narration : Mei Yui Character Supervision : Kafue