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EDIT - A person named unknown translated this chapter. You can read it HERE. The summary I wrote here is my own impression of the chapter, but I suggest you read the translation yourself and form your own opinions.
I think this chapter is pretty self-explanatory, but to briefly sum it up: Matsunaga tells Shiharu he loves her and has probably always loved her ever since he first met her, and that although he respects her for how much more mature she is than other kids her age, in the end she is still a child. So he tells her to go out into the world and experience everything she can with whomever she wants, and then when she becomes the age he is now (about 10 years from now) he wants her to think about him again, and give him a response about her feelings for him then.The ring is a symbol of his promise to her that he'll wait with unchanging feelings until then and not be mad even if she decides she doesn't like him. Shiharu's about to blurt out that this is BS because she loves him and wants to do the nasty with him ASAP (or at least that's what I was hoping she'd say) but then Aoi came in saying he had to go pee.
I'm thoroughly disgusted with this chapter and thinking about forsaking this series completely. I really don't have the fortitude to hang in there for another 100 chapters until the latest drama is resolved. I don't think I have the fortitude for another 20 chapters of this! My gentle heart can't take it!