I think there are some pages missing in the beginning ┑( ̄Д  ̄)┍ https://www.nicoobook.com/archives/401812.html
Yeah, it looks like a lot is missing
That's the sequel one when they are already lovey dovey~
Seems to be the second volume.
https://www.yaoiotaku.com/forums/threads/45135-Ai-ni-Oboresou-%F0%9F%92%A6-HONJOU-Rie-JP?highlight=Naburareru
I think there are some pages missing in the beginning ┑( ̄Д  ̄)┍
https://www.nicoobook.com/archives/401812.html