This song by Momoe Yamaguchi（山口百恵）was something that I only found out about not too long ago but it's one that I have quickly grown to enjoy. I never saw it in her BEST compilation albums and never heard it performed on any of Yamaguchi's TV appearances but I think that perhaps her discography of wonderful music was so large that it was just treated as a relatively minor hit.
Her 8th single "Mizuumi no Kesshin" (Lakeside Resolution) starts off with a question by the singer herself "Do you believe in destiny?" and then progresses into some soul-searching while Momoe-chan and her boyfriend take a walk by a body of water. She has to ponder within herself whether this man is THE ONE for her.
"Mizuumi no Kesshin" was released in March 1975 and as a relatively early single in her career, Yamaguchi was singing this with the innocence of a girl grappling with these new feelings of love which was quite different from what she would often be singing in the latter half of her career when her persona in those songs was more of a jaded figure who knew her way around the downtown life. Mind you, even in the early 1970s, some of her singles back then also raised eyebrows with their perceived raciness in the lyrics.
Strangely enough, it was the same duo behind one of those supposedly racy tunes "Hito Natsu no Keiken"（ひと夏経験）, lyricist Kazuya Senke（千家和也）and composer Shunichi Tokura（都倉俊一）who also worked on "Mizuumi no Kesshin" which raises much milder sentiments. The dreamy delivery of her vocals, the tenderhearted mandolin in the intro, and the wistful arrangement of the song help bring out the sighworthy nostalgia. "Mizuumi no Kesshin" reached No. 5 on Oricon and ended up as the 44th-ranked single of the year. It was also a track on Yamaguchi's 6th studio album "Juu-roku-sai no Tehma"（16才のテーマ...Theme of a 16-Year-Old）from May of that year; it made it all the way up to No. 3 and was the 48th-ranked album for 1975.