(applies to first 3 months on monthly plan)
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After a thorough examination, Koharu is diagnosed with aplastic anemia. In the meantime, a present arrives at Koharu's house from her mother.
Without telling her mother about the illness, Koharu, aware of the deterioration of her own medical condition, asks her mother to live with her and her kids. However, the mother stubbornly refuses.
Koharu goes to Shin's birthplace and receives a letter that he left four summers ago. In the letter, he talks about memories from the past that he never told her, and the true reason why he visited Koharu's family four summers ago.
Koharu is intensely upset when she learns what Shiori has done to Shin. Koharu makes up her mind to leave the house, and her mother struggles between her two daughters.