Ask Affection
https://myreadingmanga.info/yoichi-makina-ask-affection-eng/
Curious Recipe
Not completly a stalker since he got the pictures from the mom of the MC but still, how did he get the key of his appartment ? And we got no real conclusion about the crazy guy who stabed himself. Same, the friend who has feelings for the MC from nowhere and got no happy ending is a little sad. Moreover when his brother/nephew (? well relative at least, the one with glasses) and friend got himself a guy as well in the side story. Btw too bad the side story was so short.
Saturday Evening at That Station
Zetsubou ni Nake
https://www.boys-loves.fr/yaoi/Le-Cri-du-desespoir-Tome-1-Livre-Manga-Yaoi-Hana-Collection-produit-manga-1673.html
Tosca no Inu