Tsuzura-senpai wa Motokano dakara
つづら先輩は元カノだから
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-Description
Ritsu Osanai is a high school boy who wishes for nothing more than a perfect, peaceful life. But at the high school he attends is Sana Tsuzura, his senpai and the "ex-girlfriend" he dated back in middle school...!? His high school life, constantly thrown into disarray by his unpredictable ex-girlfriend, is about to begin...! (Source: Shueisha, translated)