Jibun wo Make Heroine da to Omoikonde Iru Sude ni Shori Zumi no Osananajimi 2 (GA Bunko) [Light Novel]

[Machine Translation] Aika has managed to get Kanata and Sayuri Amazawa, a transfer student with the appearance of a heroine, into a (tentative) lover's relationship. She has been doing her daily routine (kissing) well, and during the summer vacation, she is going to be a slayer in a cute and sexy swimsuit! But.... But.... Hey there! Oh, should I have called you "big brother"? ( smirk ) " Oh, big brother! The sudden revelation that (Sota's) parents have remarried. And the other's stepdaughter is a cute silver-haired beautiful girl (gal)...! The two became brother and sister after their parents' sudden remarriage. However, their parents are busy with work and rarely come home. They naturally spend more time together. They begin to see each other as a man and a woman, and through a casual encounter.... --I've fallen in love with my brother. ...It's too strong. If things continue as they are, her childhood friend ( Aika ) will lose her place as the defeated heroine to her out-of-the-way sister-in-law. If that's the case... I'm not sure if it's time for us to have sex, right? Before she can start living with her sister-in-law, she has to win the battle! This is a "victory confirmed" love comedy by the self-proclaimed defeated heroine!

何とか奏汰と恋人(仮)な関係に漕ぎ着いた愛歌。毎日の日課(キス)もしっかりこなし、夏休みは可愛くてセクシーな水着で悩殺だ!なんて意気込んでいたのだけど...。「さ、再婚!?」突然明かされる奏汰の親の再婚。しかも連れ子にこんな、銀髪美少女が居るなんて―!このままだと、愛歌は負けヒロインとして、ぽっと出の義妹に居場所を奪われる。だったら―。「...そろそろ、シても良い頃よね?」彼女と同棲(注:同居です)を始める前に勝負をつけないと!自称“負けヒロイン”がおくる、“勝利確定済み”ラブコメディ!