In GREAT need of someone fluent in Japanese!

[hireshi]

Can someone who fully understands Japanese give me the name of the song that starts at 5:00 (last song) in this YouTube video:

w ww . youtube . com/watch?v=YyDP63j-3qA

I have asked so many places, nobody knows the name, and the Author of the video refuse to reply
Or if anyone could write down the lyrics in English giving me a slightly hope to find the artist/track name. Help would be so incredibly much appreciated!

 

[SushiShin]

海水浴場(kaisuiyokujou) and it's a OP from some kind of anime but futher more I don't know

 

[Toritoribe]

窶堋｢窶堙俄?堋ｵ窶堋ｦ窶堙固椎ｽ(Inishie no Tsuki) by 窶｢ﾃ絶?督ｶ窶氾ｳ窶ｰﾃ?Katakiri Rekka)

It's the first tune of the album 窶ｰi窶ｹvﾂ皇窶凖ｩﾂ渉ｭﾂ鞘? feat.窶｢ﾃ絶?督ｶ窶氾ｳ窶ｰﾃ?Eikyuu Koutei Shoujo feat. Katakiri Rekka); the sound track of a PC game 窶ｰi窶ｹvﾂ皇窶凖ｩﾂ渉ｭﾂ鞘??Eikyuu Koutei Shoujo.)

 

[hireshi]

いにしえの月(Inishie no Tsuki) by 片霧烈火(Katakiri Rekka)
It's the first tune of the album 永久皇帝少女 feat.片霧烈火(Eikyuu Koutei Shoujo feat. Katakiri Rekka); the sound track of a PC game 永久皇帝少女(Eikyuu Koutei Shoujo.)

Thank you so much! I've been looking for this song for over a year now, and I finally found some results worth listening too
Thanks again, this means a whole lot to me

You don't know where I can download it too? I don't find any results for the song on Google, and I don't understand the Japanese websites of the artist =(