Does anyone know what manga is this?

[Asuka]

So there was this really old manga that I read like years ago... almost a decade ago I think. It was about detective and stuffs, so the main character is this young innocent boy called Leo iirc and also an oneesan with big boobs...and black, long hair I think. This young boy actually had a split personality or smth?? Like he somehow goes batshit, and it somehow activates whenever he sees this oneesan's boobs when being exposed.

I just can't remember the title somehow... does anyone know? That's pretty much all I could remember lol.

[Okarin]

DNAngel by Yukiru Sugisaki?

[TheUnknownMercenary]

2 hours ago, Okarin said:

DNAngel by Yukiru Sugisaki?

No, I recognize the description but it is in no way DNAngel lol

[xGreyHound]

11 hours ago, Asuka said:

So there was this really old manga that I read like years ago... almost a decade ago I think. It was about detective and stuffs, so the main character is this young innocent boy called Leo iirc and also an oneesan with big boobs...and black, long hair I think. This young boy actually had a split personality or smth?? Like he somehow goes batshit, and it somehow activates whenever he sees this oneesan's boobs when being exposed.

I just can't remember the title somehow... does anyone know? That's pretty much all I could remember lol.

Sound like a doujin, google detective doujin manga or something like that.

[Kaykeiokay]

The Mythical Detective Loki Ragnarok by Kinoshita Sakura? I haven't read it personally but it seems to match up pretty closely to your description.............. _{I think}

[Asuka]

Doesn't seem like those two titles, but thanks though haha