Schwarzesmarken: At Ease

Theodor Eberbach looks on as Lise Hohenstein smiles

Theodor Eberbach and his step-sister, Lise Hohenstein, are pilots in the same East German battle squadron during the brutal war against the BETA alien invasion, so they keep an eye out for one another.
From the anime series Schwarzesmarken

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Saikin, Imouto no Yousu ga Chotto Okashiinda ga: Sure, I Guess

Yuuya Kanzaki smiles while Mitsuki Kanzaki looks away

Both Yuuya Kanzaki and Mitsuki Kanzaki have difficulty adjusting to each other as stepbrother and stepsister after his dad and her mom get married.
From the anime series Saikin, Imouto no Yousu ga Chotto Okashiinda ga. (Recently, My Sister is Unusual)