Elementary School Girls Who Become Lovers for Some Reason as an Opportunity to Move

For Ena, Kokona is her best friend that she loves dearly. That's why she thought there was nothing being hidden from her, but just before summer break, she's told that Kokona is moving away. It's incredibly painful, but Ena tries to think that Kokona must be going through something even harder, so she should just endure it. However, Kokona is being far too calm about this! Before she knows it, Ena snaps at her. Then Kokona makes an unexpected proposal to Ena? Elementary school classmates, childhood friends, yuri.