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Artist's commentary
Midsummer Se...
2018/5/28 23:01 Photoshop, CLIP STUDIO PAINT
"Hiro... so hey... what do you think sex feels like...? ///"
暑いですね
自然と全裸を描いてしまいます
すじマーーーーン！！！！
Manatsu no Setsuna (真夏のセツナ) is an ED for Franxx. The Japanese post title is "Manatsu no Se-..." with the "Se-" potentially being "Sekkusu" (Sex).
In English, the song title could be translated into something like "Midsummer Moment", "Midsummer Instant", "Midsummer Second".