5000-kai no Oyasumi no Ato de

Ryouta Tsujisawa is an attractive but introverted university student who relies on his pet turtle for emotional support. In addition, he is still in love with Hajime Imoto, his middle school tutor; thus, he has decided to remain single for the rest of his life. But when he reunites with Hajime, who is now a single father, everything dramatically changes. Hajime, who isn't the best cook, begs Ryouta, who can do any chores, to work part-time as a housekeeper. Hajime's 5-year-old son Saku grows fond of Ryouta, and the three of them enjoy spending time together. However, one night after drinking with Hajime, Ryouta lets his guard down and confesses his feelings. Will he be able to continue working part-time like this?

(Source: Kadokawa, translated)

Note: Includes one extra chapter.