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From Eternal Heart:
In the spring of Chitose's 1st year of middle school, Mika, who shares the same last name as Chitose, is transfered into her class. Mika is pretty, quiet, and sticks like glue to Matsuura whom Chitose has unrequited love for. Chitose is bothered by the relationship between Mika, who won't make any female friends, and Matsuura, who is treating Mika kindly. Meanwhile, it's been set that Chitose is going to transfer schools-!?
まる三角しかく 三角恋爱关系 初恋四角形 Circle Triangle Square Kasih, Bukan Kau...