Complex Age (Oneshot)
I have only read the original oneshot which is this one and not the full series under the same title.
Cor Leonis - Shishi No Sinzou
https://www.mangaupdates.com/series/822qd22/cor-leonis-shishi-no-sinzou
Crimson
https://www.mangaupdates.com/series/8svmrn2/crimson
Cut The Angel With A Scythe
Chapter 4 of Chocolate (MIHARA Mitsukazu) .
Cynical World
https://www.mangaupdates.com/series/f53h9qa/uchuu-no-hito Chapter 4 of Uchuu no Hito.
(tomato That Is) Going Bad
Raw: https://www.mangaz.com/book/detail/46421 (from ch. 5: https://vw.mangaz.com/virgo/view/46421/i:154) Adapted from "Manchester no Natsu", in which is included the original short version of this story. Raw: https://www.mangaz.com/book/detail/46181 (It's the third story) Reading order- Manchester no Natsu (1995) Chapter 3: Tomato, That Is GOING BAD 2) (Tomato That Is) Going Bad (1998) _______________________________________ It's perfect for 90s yaoi manga only it's dropped by scan group too bad but story is interesting it's somewhat twisted due to two male leads getting involved with girls , before we get to see them bloom their love it ends like this but i love that black hair guy those fluffy hairs also uke guy to dirt is father's reputation seems like he is brat who is just being rebellious but details on murder is and scenes are good.
Kowagaranai de, Soba ni Ite